ci: add Gitea CI workflow and track Convex generated types

- Add .gitea/workflows/ci.yml — runs lint, typecheck, and tests on every push
- Remove convex/_generated from .gitignore and commit the generated files so CI
  has the type information it needs without requiring a live Convex backend

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - "**"
+
+jobs:
+  ci:
+    name: Lint, Typecheck & Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Typecheck
+        run: npm run type-check
+
+      - name: Test
+        run: npm run test:once