Add core DDEV project management (list/describe/start/stop/restart)

Wire up the full stack for step 2 of the build plan: a ddev.ts CLI
wrapper in the main process (execFile + JSON envelope parsing, with a
PATH fallback since GUI apps on macOS don't inherit Homebrew's PATH),
IPC handlers exposed through a typed preload window.api surface,
TanStack Query hooks for polling/mutations, and a two-pane UI (project
list sidebar + detail panel with URLs, services, and DB credentials).

Verified end-to-end against a real scratch DDEV project: typecheck,
lint, and tests pass, and the running app correctly displays live
project data and reflects state changes (start/stop) via polling.

src/main/index.ts

@@ -2,6 +2,7 @@ import { app, shell, BrowserWindow } from 'electron'
 import { join } from 'path'
 import { electronApp, optimizer, is } from '@electron-toolkit/utils'
 import icon from '../../resources/icon.png?asset'
+import { registerProjectsIpc } from './ipc/projects'
 
 function createWindow(): void {
   // Create the browser window.
@@ -50,6 +51,8 @@ app.whenReady().then(() => {
     optimizer.watchWindowShortcuts(window)
   })
 
+  registerProjectsIpc()
+
   createWindow()
 
   app.on('activate', function () {