Initial implementation of UniFi MCP Light server

Implements Hybrid MCP Light pattern with:
- 4 specific tools: list_clients, list_devices, get_system_info, get_network_health
- Meta tools: tool_index, api_call (raw API pass-through)
- API documentation resource at unifi://api-reference
- Starlette wrapper with /health endpoint
- Write protection (UNIFI_ALLOW_WRITES env var)
- UniFi OS auto-detection (proxy vs direct paths)
- Docker multi-stage build
- Gitea CI workflow

Closes #1, #2, #3, #4, #5, #7

.gitea/workflows/build.yaml

@@ -0,0 +1,30 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+      - master
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: catthehacker/ubuntu:act-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Login to Gitea Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: gitea.ext.ben.io
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.CR_PAT }}
+
+      - name: Build and Push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: gitea.ext.ben.io/${{ gitea.repository }}:latest