feat: Add Whisper GPU speech-to-text with progressive transcription

- Add faster-whisper Python server for GPU-accelerated transcription
- Support dual mode: Web Speech API or Whisper GPU (toggleable)
- Progressive transcription every 3 seconds while recording
- Separate terminal server process (stable during hot-reload)
- Add Ctrl+V paste and Ctrl+C copy support in FloatingTerminal
- Add MCP tools: whisper_start, whisper_stop, whisper_toggle, whisper_status
- Update package.json with separate api/terminal/frontend processes

frontend/src/components/FloatingTerminal.vue

@@ -250,13 +250,38 @@ function initTerminal() {
     }
   })
 
-  // Capture Ctrl+E even when terminal has focus
+  // Capture Ctrl+E and Ctrl+V when terminal has focus
   terminal.attachCustomKeyEventHandler((e) => {
+    // Ctrl+E: Toggle terminal
     if (e.ctrlKey && e.key === 'e') {
       e.preventDefault()
       toggleTerminal()
-      return false // Prevent terminal from processing
+      return false
     }
+
+    // Ctrl+V: Paste from clipboard
+    if (e.ctrlKey && e.key === 'v' && e.type === 'keydown') {
+      e.preventDefault()
+      navigator.clipboard.readText().then((text) => {
+        if (text && socket && socket.readyState === WebSocket.OPEN) {
+          socket.send(JSON.stringify({ type: 'input', data: text }))
+        }
+      }).catch((err) => {
+        console.error('[Terminal] Clipboard read failed:', err)
+      })
+      return false
+    }
+
+    // Ctrl+C: Copy selection (if any)
+    if (e.ctrlKey && e.key === 'c' && e.type === 'keydown') {
+      const selection = terminal?.getSelection()
+      if (selection) {
+        navigator.clipboard.writeText(selection).catch(console.error)
+        return false
+      }
+      // If no selection, let Ctrl+C pass through as SIGINT
+    }
+
     return true // Let terminal handle other keys
   })
 }