Fix PUT/POST responses returning zero for count fields

[Copilot]

PUT/POST requests for projects returned number_of_embeddings: 0 even when embeddings existed, while subsequent GET requests returned the correct count. Same issue occurred with number_of_instances in LLM service definition responses.

Changes

Projects (internal/handlers/projects.go)

• Added CountEmbeddingsByProject query before building PUT/POST response
• Applies to both putProjectFunc and postProjectFunc (delegates to PUT)

LLM Service Definitions (internal/handlers/llm_services.go)

• Added CountInstancesByDefinition query before building PUT response
• Same pattern as projects fix

Test Coverage (internal/handlers/projects_put_with_embeddings_test.go)

• Added integration test validating PUT returns correct embedding count
• Verifies GET/PUT response consistency

Example

PUT /v1/projects/alice/my-project
{
  "project_handle": "my-project",
  "description": "Updated description"
}

Before: {"number_of_embeddings": 0, ...}
After:  {"number_of_embeddings": 176942, ...}

The response now queries the database for actual counts rather than defaulting to zero, matching GET behavior.

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[awagner-mainz]

Looks good.