Add external AI assistant with Pipelock security proxy (#1069)

* feat(helm): add Pipelock ConfigMap, scanning config, and consolidate compose

- Add ConfigMap template rendering DLP, response scanning, MCP input/tool
  scanning, and forward proxy settings from values
- Mount ConfigMap as /etc/pipelock/pipelock.yaml volume in deployment
- Add checksum/config annotation for automatic pod restart on config change
- Gate HTTPS_PROXY/HTTP_PROXY env injection on forwardProxy.enabled (skip
  in MCP-only mode)
- Use hasKey for all boolean values to prevent Helm default swallowing false
- Single source of truth for ports (forwardProxy.port/mcpProxy.port)
- Pipelock-specific imagePullSecrets with fallback to app secrets
- Merge standalone compose.example.pipelock.yml into compose.example.ai.yml
- Add pipelock.example.yaml for Docker Compose users
- Add exclude-paths to CI workflow for locale file false positives

* Add external assistant support (OpenAI-compatible SSE proxy)

Allow self-hosted instances to delegate chat to an external AI agent
via an OpenAI-compatible streaming endpoint. Configurable per-family
through Settings UI or ASSISTANT_TYPE env override.

- Assistant::External::Client: SSE streaming HTTP client (no new gems)
- Settings UI with type selector, env lock indicator, config status
- Helm chart and Docker Compose env var support
- 45 tests covering client, config, routing, controller, integration

* Add session key routing, email allowlist, and config plumbing

Route to the actual OpenClaw session via x-openclaw-session-key header
instead of creating isolated sessions. Gate external assistant access
behind an email allowlist (EXTERNAL_ASSISTANT_ALLOWED_EMAILS env var).
Plumb session_key and allowedEmails through Helm chart, compose, and
env template.

* Add HTTPS_PROXY support to External::Client for Pipelock integration

Net::HTTP does not auto-read HTTPS_PROXY/HTTP_PROXY env vars (unlike
Faraday). Explicitly resolve proxy from environment in build_http so
outbound traffic to the external assistant routes through Pipelock's
forward proxy when enabled. Respects NO_PROXY for internal hosts.

* Add UI fields for external assistant config (Setting-backed with env fallback)

Follow the same pattern as OpenAI settings: database-backed Setting
fields with env var defaults. Self-hosters can now configure the
external assistant URL, token, and agent ID from the browser
(Settings > Self-Hosting > AI Assistant) instead of requiring env vars.
Fields disable when the corresponding env var is set.

* Improve external assistant UI labels and add help text

Change placeholder to generic OpenAI-compatible URL pattern. Add help
text under each field explaining where the values come from: URL from
agent provider, token for authentication, agent ID for multi-agent
routing.

* Add external assistant docs and fix URL help text

Add External AI Assistant section to docs/hosting/ai.md covering setup
(UI and env vars), how it works, Pipelock security scanning, access
control, and Docker Compose example. Drop "chat completions" jargon
from URL help text.

* Harden external assistant: retry logic, disconnect UI, error handling, and test coverage

- Add retry with backoff for transient network errors (no retry after streaming starts)
- Add disconnect button with confirmation modal in self-hosting settings
- Narrow rescue scope with fallback logging for unexpected errors
- Safe cleanup of partial responses on stream interruption
- Gate ai_available? on family assistant_type instead of OR-ing all providers
- Truncate conversation history to last 20 messages
- Proxy-aware HTTP client with NO_PROXY support
- Sanitize protocol to use generic headers (X-Agent-Id, X-Session-Key)
- Full test coverage for streaming, retries, proxy routing, config, and disconnect

* Exclude external assistant client from Pipelock scan-diff

False positive: `@token` instance variable flagged as "Credential in URL".
Temporary workaround until Pipelock supports inline suppression.

* Address review feedback: NO_PROXY boundary fix, SSE done flag, design tokens

- Fix NO_PROXY matching to require domain boundary (exact match or .suffix),
  case-insensitive. Prevents badexample.com matching example.com.
- Add done flag to SSE streaming so read_body stops after [DONE]
- Move MAX_CONVERSATION_MESSAGES to class level
- Use bg-success/bg-destructive design tokens for status indicators
- Add rationale comment for pipelock scan exclusion
- Update docs last-updated date

* Address second round of review feedback

- Allowlist email comparison is now case-insensitive and nil-safe
- Cap SSE buffer at 1 MB to prevent memory blowup from malformed streams
- Don't expose upstream HTTP response body in user-facing errors (log it instead)
- Fix frozen string warning on buffer initialization
- Fix "builtin" typo in docs (should be "built-in")

* Protect completed responses from cleanup, sanitize error messages

- Don't destroy a fully streamed assistant message if post-stream
  metadata update fails (only cleanup partial responses)
- Log raw connection/HTTP errors internally, show generic messages
  to users to avoid leaking network/proxy details
- Update test assertions for new error message wording

* Fix SSE content guard and NO_PROXY test correctness

Use nil check instead of present? for SSE delta content to preserve
whitespace-only chunks (newlines, spaces) that can occur in code output.

Fix NO_PROXY test to use HTTP_PROXY matching the http:// client URL so
the proxy resolution and NO_PROXY bypass logic are actually exercised.

* Forward proxy credentials to Net::HTTP

Pass proxy_uri.user and proxy_uri.password to Net::HTTP.new so
authenticated proxies (http://user:pass@host:port) work correctly.
Without this, credentials parsed from the proxy URL were silently
dropped. Nil values are safe as positional args when no creds exist.

* Update pipelock integration to v0.3.1 with full scanning config

Bump Helm image tag from 0.2.7 to 0.3.1. Add missing security
sections to both the Helm ConfigMap and compose example config:
mcp_tool_policy, mcp_session_binding, and tool_chain_detection.
These protect the /mcp endpoint against tool injection, session
hijacking, and multi-step exfiltration chains.

Add version and mode fields to config files. Enable include_defaults
for DLP and response scanning to merge user patterns with the 35
built-in patterns. Remove redundant --mode CLI flag from the Helm
deployment template since mode is now in the config file.

app/controllers/settings/hostings_controller.rb

@@ -3,7 +3,7 @@ class Settings::HostingsController < ApplicationController
 
   guard_feature unless: -> { self_hosted? }
 
-  before_action :ensure_admin, only: [ :update, :clear_cache ]
+  before_action :ensure_admin, only: [ :update, :clear_cache, :disconnect_external_assistant ]
 
   def show
     @breadcrumbs = [
@@ -118,6 +118,23 @@ class Settings::HostingsController < ApplicationController
       Setting.openai_json_mode = hosting_params[:openai_json_mode].presence
     end
 
+    if hosting_params.key?(:external_assistant_url)
+      Setting.external_assistant_url = hosting_params[:external_assistant_url]
+    end
+
+    if hosting_params.key?(:external_assistant_token)
+      token_param = hosting_params[:external_assistant_token].to_s.strip
+      unless token_param.blank? || token_param == "********"
+        Setting.external_assistant_token = token_param
+      end
+    end
+
+    if hosting_params.key?(:external_assistant_agent_id)
+      Setting.external_assistant_agent_id = hosting_params[:external_assistant_agent_id]
+    end
+
+    update_assistant_type
+
     redirect_to settings_hosting_path, notice: t(".success")
   rescue Setting::ValidationError => error
     flash.now[:alert] = error.message
@@ -129,9 +146,29 @@ class Settings::HostingsController < ApplicationController
     redirect_to settings_hosting_path, notice: t(".cache_cleared")
   end
 
+  def disconnect_external_assistant
+    Setting.external_assistant_url = nil
+    Setting.external_assistant_token = nil
+    Setting.external_assistant_agent_id = nil
+    Current.family.update!(assistant_type: "builtin") unless ENV["ASSISTANT_TYPE"].present?
+    redirect_to settings_hosting_path, notice: t(".external_assistant_disconnected")
+  rescue => e
+    Rails.logger.error("[External Assistant] Disconnect failed: #{e.message}")
+    redirect_to settings_hosting_path, alert: t("settings.hostings.update.failure")
+  end
+
   private
     def hosting_params
-      params.require(:setting).permit(:onboarding_state, :require_email_confirmation, :brand_fetch_client_id, :brand_fetch_high_res_logos, :twelve_data_api_key, :openai_access_token, :openai_uri_base, :openai_model, :openai_json_mode, :exchange_rate_provider, :securities_provider, :syncs_include_pending, :auto_sync_enabled, :auto_sync_time)
+      return ActionController::Parameters.new unless params.key?(:setting)
+      params.require(:setting).permit(:onboarding_state, :require_email_confirmation, :brand_fetch_client_id, :brand_fetch_high_res_logos, :twelve_data_api_key, :openai_access_token, :openai_uri_base, :openai_model, :openai_json_mode, :exchange_rate_provider, :securities_provider, :syncs_include_pending, :auto_sync_enabled, :auto_sync_time, :external_assistant_url, :external_assistant_token, :external_assistant_agent_id)
+    end
+
+    def update_assistant_type
+      return unless params[:family].present? && params[:family][:assistant_type].present?
+      return if ENV["ASSISTANT_TYPE"].present?
+
+      assistant_type = params[:family][:assistant_type]
+      Current.family.update!(assistant_type: assistant_type) if Family::ASSISTANT_TYPES.include?(assistant_type)
     end
 
     def ensure_admin