Add database tools: snapshots and import/export (step 4)

Snapshot create/list/restore/delete and DB import/export via native
file dialogs, all routed through the streaming commandRunner from
step 3. `ddev snapshot restore` has no project-name flag (unlike every
other ddev command used so far) — it resolves the project from cwd,
so commandRunner/execDdev now accept an optional cwd and every
database command runs with cwd = project approot instead of passing
the name positionally.

Fixed a real bug found via live testing: the snapshot-naming UI used
window.prompt(), which Electron's renderer does not support (it
returns null with no dialog, silently). window.confirm() does work
(verified: real native dialog, respects accept/dismiss) so the delete
confirmation was left as-is. Snapshot naming now uses an inline text
input instead.

Verified end-to-end against the real scratch DDEV project via CDP-
driven clicks: named snapshot creation, deletion, and restore
(streamed output ending in "Database snapshot restoretest was
restored in 7s") all confirmed working through the actual UI.
import-db/export-db verified via direct CLI round-trip using the
exact --file= flag syntax the app invokes (skipped UI-driving these
since they open native OS file dialogs that CDP cannot dismiss).

src/main/index.ts

@@ -4,6 +4,7 @@ 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'
+import { registerDatabaseIpc } from './ipc/database'
 
 function createWindow(): void {
   // Create the browser window.
@@ -54,6 +55,7 @@ app.whenReady().then(() => {
 
   registerProjectsIpc()
   registerTerminalIpc()
+  registerDatabaseIpc()
 
   createWindow()