Rebrand the entire application from "胡萝卜社区" (Carrot BBS) to "威友" (WithYou), including:

- Update app name, package name (skin.carrot.bbs → cn.qczlit.withyou), and bundle identifier
- Update API endpoints (bbs.littlelan.cn → withyou.littlelan.cn)
- Update URL scheme (carrotbbs:// → withyou://)
- Rename database from carrot_bbs to with_you
- Update CI/CD pipeline image names and artifact naming
- Add Android signing configuration for release builds
- Update all UI text and comments throughout the codebase
- Refactor registerStore to use in-memory state instead of AsyncStorage persistence
- Improve WebRTC track handling and call stream management
- Add metro platform resolution for native platform support

BREAKING app package, database, and URLs are no longer valid

package-lock.json

@@ -1,12 +1,12 @@
 {
-  "name": "carrot_bbs",
-  "version": "1.0.3",
+  "name": "with_you",
+  "version": "0.1.sha",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "carrot_bbs",
-      "version": "1.0.3",
+      "name": "with_you",
+      "version": "0.1.sha",
       "dependencies": {
         "@expo/vector-icons": "^15.1.1",
         "@react-native-async-storage/async-storage": "^2.2.0",