Add support for dynamic config UI (#256)

* Add support for dynamic config UI

* Add support for section description

* Better dynamic class settings

Added dynamic_fields hash field - Stores all undeclared settings
[] method - Checks declared fields first, then falls back to dynamic hash
[]= method - Updates declared fields normally, stores others in hash
No runtime field declaration - Fields are never dynamically created on the class

* FIX proper lookup for provider keys

- Also validate configurable values properly.
- Change Provider factory to use Rails autoloading (Zeitwerk)

* Fix factory

The derive_adapter_name method relies on string manipulation ("PlaidAccount".sub(/Account$/, "") + "Adapter" → "PlaidAdapter"), but we already have explicit registration in place.

* Make updates atomic, field-aware, and handle blanks explicitly

* Small UX detail

* Add support for PlaidEU in UI also

- This looks like partial support atm

config/initializers/plaid.rb

@@ -1,18 +1,15 @@
 Rails.application.configure do
+  # Initialize Plaid configuration to nil
   config.plaid = nil
   config.plaid_eu = nil
-
-  if ENV["PLAID_CLIENT_ID"].present? && ENV["PLAID_SECRET"].present?
-    config.plaid = Plaid::Configuration.new
-    config.plaid.server_index = Plaid::Configuration::Environment[ENV["PLAID_ENV"] || "sandbox"]
-    config.plaid.api_key["PLAID-CLIENT-ID"] = ENV["PLAID_CLIENT_ID"]
-    config.plaid.api_key["PLAID-SECRET"] = ENV["PLAID_SECRET"]
-  end
-
-  if ENV["PLAID_EU_CLIENT_ID"].present? && ENV["PLAID_EU_SECRET"].present?
-    config.plaid_eu = Plaid::Configuration.new
-    config.plaid_eu.server_index = Plaid::Configuration::Environment[ENV["PLAID_ENV"] || "sandbox"]
-    config.plaid_eu.api_key["PLAID-CLIENT-ID"] = ENV["PLAID_EU_CLIENT_ID"]
-    config.plaid_eu.api_key["PLAID-SECRET"] = ENV["PLAID_EU_SECRET"]
-  end
+end
+
+# Load Plaid configuration from adapters after initialization
+Rails.application.config.after_initialize do
+  # Ensure provider adapters are loaded
+  Provider::Factory.ensure_adapters_loaded
+
+  # Reload configurations from settings/ENV
+  Provider::PlaidAdapter.reload_configuration      # US region
+  Provider::PlaidEuAdapter.reload_configuration    # EU region
 end

config/routes.rb

@@ -76,6 +76,7 @@ Rails.application.routes.draw do
     resource :llm_usage, only: :show
     resource :guides, only: :show
     resource :bank_sync, only: :show, controller: "bank_sync"
+    resource :providers, only: %i[show update]
   end
 
   resource :subscription, only: %i[new show create] do