Add live AI checks to system health (#3155)

* Add live AI checks to system health

Give super admins a dedicated AI status view with bounded liveness probes for LLMs, vector stores, pgvector, and embedding endpoints. Record sanitized failures in both the system debug log and Rails logger, and document the recommended local configuration.\n\nCloses #3145

* Fix AI health CI checks

* Address AI health review feedback

* Correct Ollama model preload guidance

* Distinguish OpenAI-compatible providers

* Make Ollama startup readiness explicit

* Recognize Cloudflare AI endpoints

test/models/vector_store/embeddable_test.rb

@@ -4,7 +4,9 @@ class VectorStore::EmbeddableTest < ActiveSupport::TestCase
   class EmbeddableHost
     include VectorStore::Embeddable
     # Expose private methods for testing
-    public :extract_text, :chunk_text, :embed, :embed_batch
+    public :extract_text, :chunk_text, :embed, :embed_batch,
+           :embedding_model, :embedding_dimensions, :embedding_uri_base,
+           :embedding_access_token
   end
 
   setup do
@@ -138,6 +140,18 @@ class VectorStore::EmbeddableTest < ActiveSupport::TestCase
     assert_raises(VectorStore::Error) { @host.embed("test text") }
   end
 
+  test "embedding configuration delegates to the shared runtime configuration" do
+    VectorStore.expects(:embedding_model).returns("model")
+    VectorStore.expects(:embedding_dimensions).returns(3)
+    VectorStore.expects(:embedding_uri_base).returns("https://embeddings.example.test/v1")
+    VectorStore.expects(:embedding_access_token).returns("token")
+
+    assert_equal "model", @host.embedding_model
+    assert_equal 3, @host.embedding_dimensions
+    assert_equal "https://embeddings.example.test/v1", @host.embedding_uri_base
+    assert_equal "token", @host.embedding_access_token
+  end
+
   # --- embed_batch ---
 
   test "embed_batch processes texts and returns ordered vectors" do