chore: add Gitea Actions CI and switch repo URLs to self-hosted Gitea

Add .gitea/workflows/publish.yml to trigger npm publish on version tags.
Update repository, bugs, and homepage URLs to git.onixbyte.com.

.gitea/workflows/publish.yml

@@ -0,0 +1,34 @@
+name: Publish to npm
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+      - "*.*.*"
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          registry-url: "https://registry.npmjs.org"
+
+      - name: Setup pnpm
+        run: corepack enable && corepack prepare pnpm@latest --activate
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build
+        run: pnpm run build
+
+      - name: Publish to npm
+        run: pnpm publish --no-git-checks
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}