fix: resolve CI/CD workflow failures

- Simplified CI workflow to use basic npm ci, npm run build, npm test steps
- Ensured package.json contains all required dependencies
- Added package-lock.json for reproducible npm ci builds
- All source files and tests are present in repository

.gitea/workflows/ci.yml

@@ -1,19 +1,25 @@
-name: CI
-
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   pull_request:
-    branches: [ main ]
+    branches: [main]
 
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-    - uses: actions/setup-node@v4
-      with:
-        node-version: '20'
-    - run: npm ci
-    - run: npm run build --if-present
-    - run: npm test --if-present
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Run tests
+        run: npm test