feat: add Gitea support to release workflow

Add platform detection to support creating releases on both GitHub
and Gitea servers. The workflow now:
- Detects the platform using github.server_url
- Uses GitHub CLI (gh) for GitHub releases
- Uses gitea-release-action for Gitea releases
- Creates draft releases with the same artifacts on both platforms

.github/workflows/release.yml

@@ -75,7 +75,8 @@ jobs:
           echo "File sizes:"
           ls -lh main.js manifest.json styles.css
 
-      - name: Create draft release
+      - name: Create draft release (GitHub)
+        if: github.server_url == 'https://github.com'
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
@@ -106,3 +107,28 @@ jobs:
 
           echo "✅ Draft release created: $TAG_VERSION"
           echo "Visit https://github.com/${{ github.repository }}/releases to review and publish"
+
+      - name: Create draft release (Gitea)
+        if: github.server_url != 'https://github.com'
+        uses: https://gitea.com/actions/gitea-release-action@main
+        with:
+          files: |
+            main.js
+            manifest.json
+            styles.css
+          draft: true
+          title: ${{ github.ref_name }}
+          body: |
+            Release ${{ github.ref_name }}
+
+            ## Changes
+
+            *Add release notes here before publishing*
+
+            ## Installation
+
+            1. Download main.js, manifest.json, and styles.css
+            2. Create a folder in .obsidian/plugins/obsidian-mcp-server/
+            3. Copy the three files into the folder
+            4. Reload Obsidian
+            5. Enable the plugin in Settings → Community Plugins