feat(ift): EventHub AI Router stack for Zed

FastAPI gateway with A/B/C lane orchestration, LiteLLM proxy config,
Swarm stack (postgres, redis, VPN off-by-default), deploy/smoke/audit scripts.

.gitea/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  push:
+    branches: [master, main]
+  pull_request:
+
+jobs:
+  build-gateway:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build gateway image
+        run: docker build -f router/Dockerfile -t ai-router-gateway:ci .
+
+      - name: Lint Python syntax
+        run: python3 -m py_compile router/*.py
+
+  sync-config:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Sync routing config
+        run: bash scripts/sync-routing-config.sh