Add game lifecycle management and instance import/export tools (#117)

## Summary by Sourcery

Add centralized game process and instance lifecycle management, shared
cache-aware path resolution, and instance import/export/repair
capabilities across backend and UI.

New Features:
- Track a single running game process in the backend, expose stop-game
control, and emit structured game-exited events with instance and
version context.
- Introduce instance path resolution that supports shared caches for
versions, libraries, and assets, and use it across game start, install,
and version management APIs.
- Add import, export, and repair operations for instances, including
zip-based archive support and automatic recovery of on-disk instances.
- Expose new instance lifecycle and repair APIs to the frontend and wire
them through the client and instance store.
- Add per-instance start/stop controls in the instances view and
instance selection in the bottom bar for launching games.

Enhancements:
- Guard instance operations with per-instance locks and track active
operations such as launch, install, delete, and import/export.
- Improve handling of Microsoft login errors and polling status, with
clearer user feedback and safer interval management.
- Simplify config mutation during shared cache migration and centralize
instance directory resolution in the backend.
- Initialize a game lifecycle listener at app startup to keep UI state
in sync with backend game exit events.

Build:
- Configure the Vite dev server to use a fixed localhost host and port
for the UI dev environment.

1 files changed, 2 insertions, 1 deletions

diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index 1c31a09..9ab9e6a 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -5,7 +5,7 @@
   "build": {
     "beforeDevCommand": "pnpm --filter @dropout/ui dev",
     "beforeBuildCommand": "pnpm --filter @dropout/ui build",
-    "devUrl": "http://localhost:5173",
+    "devUrl": "http://127.0.0.1:5173",
     "frontendDist": "../packages/ui/dist"
   },
   "app": {
@@ -20,6 +20,7 @@
       }
     ],
     "security": {
+      "devCsp": null,
       "csp": "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' https: ws: wss:;",
       "capabilities": ["default"]
     }