fix: remove hardcoded service URLs, require ENV config

- Remove hardcoded default URLs (portainer, npm, ollama, etc.)
- All external service URLs now required via ENV vars
- Remove obsolete ai_client and ai_controller (core-ai proxy)
- Clean up health_controller obsolete core-ai references
- App fails fast at startup if required config missing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/controllers/health_controller.py

@@ -11,9 +11,6 @@ from src.config import get_settings
 from src.logging_config import get_logger
 from src.models.ollama_client import get_ollama_client
 
-# Note: Agent functionality moved to separate core-ai service (Dec 2025)
-# This service (core-api) only provides infrastructure management and tools
-AGENT_AVAILABLE = False
 
 
 logger = get_logger(__name__)
@@ -134,11 +131,6 @@ class HealthController(BaseController):
                 ollama_error = str(e)
                 logger.warning(f"Ollama health check failed: {ollama_error}")
 
-            # Note: Agent functionality moved to separate core-ai service
-            # This service only needs Ollama for embeddings (infrastructure tools)
-            # Agent health is checked separately in core-ai service
-
-            # Determine overall status (only Ollama required for core-api)
             is_healthy = ollama_healthy
 
             elapsed_ms = int((time.time() - start_time) * 1000)
@@ -157,8 +149,7 @@ class HealthController(BaseController):
                             "available": False
                         },
                         "error": ollama_error
-                    },
-                    "note": "AI agent functionality available in separate core-ai service (port 8086)"
+                    }
                 }
             }
 
@@ -204,20 +195,7 @@ class HealthController(BaseController):
                     "error": str(e)
                 }
 
-            # 2. Agent Stack - Moved to separate core-ai service
-            diagnostics["components"]["agent"] = {
-                "status": "N/A",
-                "note": "AI agent functionality moved to separate core-ai service (port 8086)",
-                "check_url": "http://core-ai:8086/health"
-            }
-
-            # 3. Memory System (Qdrant) - Moved to core-ai service
-            diagnostics["components"]["qdrant"] = {
-                "status": "N/A",
-                "note": "Memory system managed by core-ai service (port 8086)"
-            }
-
-            # 4. Configuration
+            # 2. Configuration
             diagnostics["configuration"] = {
                 "agent_fallback_enabled": settings.agent_fallback_enabled,
                 "memory_tier1_max_turns": settings.memory_tier1_max_turns,