Add LLM configuration and MCP server management UI and backend functionality

- Implemented a new SPA page for LLM Bridge and MCP Server settings in `llm-config.js`.
- Added functionality for managing LLM and MCP configurations, including toggling, saving settings, and testing connections.
- Created HTTP endpoints in `llm_utils.py` for handling LLM chat, status checks, and MCP server configuration.
- Integrated model fetching from LaRuche and Ollama backends.
- Enhanced error handling and logging for better debugging and user feedback.

requirements.txt

@@ -9,3 +9,9 @@ pysmb==1.2.10
 pymysql==1.1.1
 sqlalchemy==2.0.36
 python-nmap==0.7.1
+
+# ── LLM / MCP / Discovery ─────────────────────────────────────────────
+zeroconf>=0.131.0            # LaRuche/LAND auto-discovery via mDNS
+#
+# Optional — install to unlock extra features:
+# mcp[cli]>=1.0.0           # MCP server (pip install "mcp[cli]")