feat: display app version in UI footer

- Add version package with build-time variables
- Inject version via ldflags in Dockerfile using git describe
- Show version in footer on every page
- Log version and commit on server startup

.gitea/workflows/deploy.yml

@@ -48,6 +48,8 @@ jobs:
     runs-on: games
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Need full history for git describe
 
       - name: Sync to deploy directory
         run: |
@@ -59,4 +61,8 @@ jobs:
           mkdir -p $DEPLOY_DIR/data
 
       - name: Rebuild and restart
-        run: cd $DEPLOY_DIR && docker compose up -d --build --remove-orphans
+        run: |
+          cd $DEPLOY_DIR
+          VERSION=$(git describe --tags --always)
+          COMMIT=$(git rev-parse --short HEAD)
+          VERSION=$VERSION COMMIT=$COMMIT docker compose up -d --build --remove-orphans