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>

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "core-api"
-version = "1.3.2"
+version = "1.3.3"
 description = "Core Code API - Infrastructure management and tools API"
 readme = "README.md"
 requires-python = ">=3.12"