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/preload/index.ts

@@ -1,8 +1,20 @@
-import { contextBridge } from 'electron'
+import { contextBridge, ipcRenderer } from 'electron'
 import { electronAPI } from '@electron-toolkit/preload'
+import type { DdevProjectDetail, DdevProjectSummary } from '../shared/types'
 
 // Custom APIs for renderer
-const api = {}
+const api = {
+  projects: {
+    list: (): Promise<DdevProjectSummary[]> => ipcRenderer.invoke('projects:list'),
+    describe: (name: string): Promise<DdevProjectDetail> =>
+      ipcRenderer.invoke('projects:describe', name),
+    start: (name: string): Promise<void> => ipcRenderer.invoke('projects:start', name),
+    stop: (name: string): Promise<void> => ipcRenderer.invoke('projects:stop', name),
+    restart: (name: string): Promise<void> => ipcRenderer.invoke('projects:restart', name)
+  }
+}
+
+export type Api = typeof api
 
 // Use `contextBridge` APIs to expose Electron APIs to
 // renderer only if context isolation is enabled, otherwise