chore: bump version to 0.3.0

feat(shell): real terminal with xterm.js + PTY over WebSocket

Replace fake shell input with a full PTY-backed terminal using xterm.js.
Apps like btop, vim, htop now work. AI chat panel is always visible.

Backend:
- Add WebSocket handler /api/ws/terminal with creack/pty
- Allocate real pseudo-terminal with TERM=xterm-256color
- Bidirectional I/O + dynamic resize via pty.Setsize
- Skip JSON headers on /api/ws/* paths for WebSocket upgrade

Frontend:
- Integrate xterm.js with FitAddon and WebLinksAddon
- Cyberpunk color theme matching app design
- ResizeObserver for automatic terminal resizing
- AI assistant panel always visible (340px, no toggle)
- Connection status indicator (green/red dot)

Dependencies:
- Go: github.com/gorilla/websocket, github.com/creack/pty/v2
- npm: @xterm/xterm, @xterm/addon-fit, @xterm/addon-web-links

💘 Generated with Crush

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

web/package-lock.json

@@ -6,6 +6,9 @@
     "": {
       "name": "muyue-web",
       "dependencies": {
+        "@xterm/addon-fit": "^0.11.0",
+        "@xterm/addon-web-links": "^0.12.0",
+        "@xterm/xterm": "^6.0.0",
         "react": "^19.2.5",
         "react-dom": "^19.2.5"
       },
@@ -396,6 +399,27 @@
         }
       }
     },
+    "node_modules/@xterm/addon-fit": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@xterm/addon-fit/-/addon-fit-0.11.0.tgz",
+      "integrity": "sha512-jYcgT6xtVYhnhgxh3QgYDnnNMYTcf8ElbxxFzX0IZo+vabQqSPAjC3c1wJrKB5E19VwQei89QCiZZP86DCPF7g==",
+      "license": "MIT"
+    },
+    "node_modules/@xterm/addon-web-links": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/@xterm/addon-web-links/-/addon-web-links-0.12.0.tgz",
+      "integrity": "sha512-4Smom3RPyVp7ZMYOYDoC/9eGJJJqYhnPLGGqJ6wOBfB8VxPViJNSKdgRYb8NpaM6YSelEKbA2SStD7lGyqaobw==",
+      "license": "MIT"
+    },
+    "node_modules/@xterm/xterm": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/@xterm/xterm/-/xterm-6.0.0.tgz",
+      "integrity": "sha512-TQwDdQGtwwDt+2cgKDLn0IRaSxYu1tSUjgKarSDkUM0ZNiSRXFpjxEsvc/Zgc5kq5omJ+V0a8/kIM2WD3sMOYg==",
+      "license": "MIT",
+      "workspaces": [
+        "addons/*"
+      ]
+    },
     "node_modules/detect-libc": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.1.2.tgz",