feat: rename Docker Watcher to Tinyforge

Rebrand the project as Tinyforge to reflect its evolution from a Docker
container watcher into a self-hosted mini CI/deployment platform.

Rename covers: Go module path, Docker labels, DB/config filenames,
JWT issuer, Dockerfile binary, docker-compose, CI workflows, frontend
i18n, README with static sites docs, and all code comments.

.gitea/workflows/build.yml

@@ -0,0 +1,38 @@
+name: Build
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.24'
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install frontend dependencies
+        working-directory: web
+        run: npm ci --no-audit
+
+      - name: Build frontend
+        working-directory: web
+        run: npm run build
+
+      - name: Vet Go code
+        run: go vet ./...
+
+      - name: Build Go binary
+        run: CGO_ENABLED=0 go build -ldflags="-s -w" -o tinyforge ./cmd/server
+
+      - name: Build Docker image
+        run: docker build -t tinyforge:dev .