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/ipc/projects.ts

@@ -0,0 +1,10 @@
+import { ipcMain } from 'electron'
+import { describeProject, listProjects, restartProject, startProject, stopProject } from '../ddev'
+
+export function registerProjectsIpc(): void {
+  ipcMain.handle('projects:list', () => listProjects())
+  ipcMain.handle('projects:describe', (_event, name: string) => describeProject(name))
+  ipcMain.handle('projects:start', (_event, name: string) => startProject(name))
+  ipcMain.handle('projects:stop', (_event, name: string) => stopProject(name))
+  ipcMain.handle('projects:restart', (_event, name: string) => restartProject(name))
+}