feat(extension): Chrome/Edge only + side panel chat tabs (v0.9.0)

- Remove Firefox build support (CI, Makefile, wxt config)
- Fix chrome.alarms undefined error (add 'alarms' permission)
- Add Chat tab to side panel connected to Studio API (/api/chat)
- Streaming SSE, tool calls, code blocks, thinking display
- Shared chat history with desktop Studio
- New lib/api.js client for extension chat endpoints

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

.gitea/workflows/ci-develop.yml

@@ -40,14 +40,6 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-node-web-
 
-      - name: Cache Node modules (extension)
-        uses: actions/cache@v4
-        with:
-          path: extension/node_modules
-          key: ${{ runner.os }}-node-ext-${{ hashFiles('extension/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-node-ext-
-
       - name: Download Go dependencies
         run: go mod download
 
@@ -62,7 +54,6 @@ jobs:
           cd extension
           npm ci
           npx wxt zip
-          npx wxt zip --browser firefox
           mkdir -p ../dist
           mv .output/muyue-extension-*.zip ../dist/