fix(ci): remove GitHub-specific marketplace actions incompatible with Gitea act runner

- Remove actions/cache@v4 (uses GitHub's artifact API not available in Gitea)
- Remove actions/upload-artifact@v4 (same reason)
- Remove actions/download-artifact@v4 (same reason)
- Deploy job now builds from source instead of downloading artifacts
- Deploy container changed from alpine:3.20 to node:22-alpine for npm build

.gitea/workflows/build.yml

@@ -44,14 +44,6 @@ jobs:
           git checkout "${{ github.sha }}"
         shell: sh
 
-      - name: Cache npm dependencies
-        uses: actions/cache@v4
-        with:
-          path: node_modules/
-          key: ${{ runner.os }}-npm-${{ hashFiles('package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-npm-
-
       - name: Install dependencies
         run: npm ci --no-audit --no-fund
 
@@ -82,14 +74,6 @@ jobs:
           git checkout "${{ github.sha }}"
         shell: sh
 
-      - name: Cache npm dependencies
-        uses: actions/cache@v4
-        with:
-          path: node_modules/
-          key: ${{ runner.os }}-npm-${{ hashFiles('package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-npm-
-
       - name: Install dependencies
         run: npm ci --no-audit --no-fund
 
@@ -98,13 +82,6 @@ jobs:
         env:
           VITE_API_ORIGIN: ${{ vars.VITE_API_ORIGIN || '' }}
 
-      - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: dist
-          path: dist/
-          retention-days: 7
-
   # ──────────────────────────────────────────────
   #  DEPLOY (manual): to shared hosting via SSH
   # ──────────────────────────────────────────────
@@ -112,7 +89,7 @@ jobs:
     name: Deploy to shared hosting
     runs-on: ubuntu-latest
     container:
-      image: alpine:3.20
+      image: node:22-alpine
     if: github.ref == 'refs/heads/develop'
     needs: [lint, build]
     environment:
@@ -134,16 +111,18 @@ jobs:
           git checkout "${{ github.sha }}"
         shell: sh
 
+      - name: Install dependencies
+        run: npm ci --no-audit --no-fund
+
+      - name: Build project
+        run: npm run build
+        env:
+          VITE_API_ORIGIN: ${{ vars.VITE_API_ORIGIN || '' }}
+
       - name: Install SSH and rsync
         run: |
           apk add --no-cache openssh-client sshpass rsync
 
-      - name: Download built artifacts
-        uses: actions/download-artifact@v4
-        with:
-          name: dist
-          path: dist/
-
       - name: Deploy built files to shared hosting
         run: |
           sshpass -p "${{ secrets.SSH_PASSWORD }}" rsync -avz --delete \