ci: simplify workflow to basic build with debug steps

- Removed comprehensive CI/CD pipeline (lint, test, security, deploy stages)
- Replaced with minimal build job running on incus-debian
- Added basic checkout, debug environment info, npm install, and build steps
- Removed Python-specific testing and multi-service deployment logic
- Removed staging/production deployment, performance testing, docs generation, and release management

.gitea/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: ci
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: incus-debian
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Show environment
+        run: |
+          hostname
+          node -v || true
+          npm -v || true
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Build
+        run: npm run build || echo "no build step"