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>

internal/version/version.go

@@ -7,7 +7,7 @@ import (
 
 const (
 	Name    = "muyue"
-	Version = "0.8.0"
+	Version = "0.9.0"
 	Author  = "La Légion de Muyue"
 )