Add streaming terminal panel, status bar, and toast notifications

Step 3 of the build plan. Long-running ddev commands (start/stop/
restart) now spawn via commandRunner.ts and stream stdout/stderr to
the renderer over IPC (terminal:data/terminal:exit), instead of the
previous fire-and-forget JSON exec. A single useTerminalEvents hook
owns turning those events into terminal panel lines, status bar
progress, and success/error toasts, decoupled from whichever mutation
triggered the command so later features (snapshots, addons) can reuse
the same pipeline. Cancel is wired end-to-end: the status bar's Cancel
button kills the underlying child process via a tracked operation id.

Verified against the real scratch DDEV project via a CDP driver
script (Electron launched with --remoteDebuggingPort, driven by
clicking real DOM buttons): confirmed live streaming output, the
status bar's spinner/cancel affordance, and that cancelling mid-
restart genuinely interrupts the process rather than just hiding the
UI (only the first output line appears, vs. full output on a normal
run).

src/main/index.ts

@@ -3,6 +3,7 @@ import { join } from 'path'
 import { electronApp, optimizer, is } from '@electron-toolkit/utils'
 import icon from '../../resources/icon.png?asset'
 import { registerProjectsIpc } from './ipc/projects'
+import { registerTerminalIpc } from './ipc/terminal'
 
 function createWindow(): void {
   // Create the browser window.
@@ -52,6 +53,7 @@ app.whenReady().then(() => {
   })
 
   registerProjectsIpc()
+  registerTerminalIpc()
 
   createWindow()