refactor: remove Ollama integration and unused AI configuration

- Remove src/models/ollama_client.py, embeddings.py, embeddings_ollama.py
- Remove model aliases and AI config from settings (both config.py files)
- Update health endpoints to only check database connectivity
- Update tests to reflect database-only health checks
- Update README, .env.example, and OIDC docstrings

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

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

README.md

@@ -19,8 +19,7 @@ Central API service providing infrastructure management, home automation, and ut
 
 ### Utilities
 - **DNS Lookup**: Query DNS records (A, AAAA, MX, TXT, CNAME, NS, SOA, PTR)
-- **Health Checks**: Comprehensive service health monitoring
-- **AI Metrics Proxy**: Forward metrics requests to Core-AI service
+- **Health Checks**: Service health monitoring with database connectivity status
 
 ## Architecture
 
@@ -35,10 +34,8 @@ src/
 ├── clients/
 │   ├── homeassistant_client.py    # Home Assistant REST client
 │   ├── npm_client.py              # Nginx Proxy Manager client
-│   ├── ollama_client.py           # Ollama LLM client
 │   └── portainer_client.py        # Portainer API client
 ├── controllers/
-│   ├── ai_controller.py           # AI metrics proxy
 │   ├── health_controller.py       # Health endpoints
 │   ├── housekeeping_controller.py # Home automation endpoints
 │   ├── infrastructure_controller.py # Infrastructure management
@@ -88,9 +85,6 @@ src/
 ### Tools (`/tools`)
 - `POST /tools/dns/lookup` - DNS record lookup
 
-### AI (`/ai`)
-- `GET /ai/metrics` - Proxy to Core-AI metrics
-
 ## Development
 
 ### Requirements
@@ -169,7 +163,6 @@ docker run -p 8083:8083 core-code:latest
 | `NPM_PASSWORD` | NPM admin password | - |
 | `HOMEASSISTANT_URL` | Home Assistant URL | `http://localhost:8123` |
 | `HOMEASSISTANT_TOKEN` | HA long-lived access token | - |
-| `OLLAMA_URL` | Ollama API URL | `http://localhost:11434` |
 | `OIDC_ENABLED` | Enable OIDC auth | `false` |
 | `OIDC_ISSUER` | OIDC issuer URL | - |
 | `OIDC_AUDIENCE` | OIDC audience | - |
@@ -183,9 +176,9 @@ Once deployed, access documentation at:
 
 ## Health Checks
 
-- **Basic**: `GET /health` - Returns status and Ollama connection
-- **Full**: `GET /health/full` - Returns all component statuses (503 if unhealthy)
-- **Diagnostics**: `GET /health/diagnostics` - Detailed service information
+- **Basic**: `GET /health` - Fast liveness check for container orchestration
+- **Full**: `GET /health/full` - Returns database status (503 if unhealthy)
+- **Diagnostics**: `GET /health/diagnostics` - Service info and configuration
 
 ## Security