feat: Add Firebase configuration for staging and development environments

- Created google-services.json for staging environment.
- Updated firebase.json to include build configurations for dev and staging.
- Added flutterfire-config.sh script to generate Firebase configuration files.
- Modified Xcode project to include GoogleService-Info.plist for staging.
- Created staging.xcscheme for Xcode build configuration.
- Added GoogleService-Info.plist for dev and staging flavors.
- Generated firebase_options_dev.dart and firebase_options_staging.dart for Firebase initialization.

.vscode/launch.json

@@ -0,0 +1,69 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "krow-staff-application (DEV iOS)",
+      "request": "launch",
+      "type": "dart",
+      "program": "mobile-apps/staff-app/lib/main_dev.dart",
+      "flutterMode": "debug",
+      "toolArgs": ["--flavor", "dev"]
+    },
+    {
+      "name": "krow-staff-application (DEV Android)",
+      "request": "launch",
+      "type": "dart",
+      "program": "lmobile-apps/staff-app/lib/main_dev.dart",
+      "flutterMode": "debug",
+      "toolArgs": ["--flavor", "dev"]
+    },
+    {
+      "name": "krow-staff-application (STAGING iOS)",
+      "request": "launch",
+      "type": "dart",
+      "program": "mobile-apps/staff-app/lib/main_dev.dart",
+      "flutterMode": "debug",
+      "toolArgs": ["--flavor", "staging"]
+    },
+    {
+      "name": "krow-staff-application (STAGING Android)",
+      "request": "launch",
+      "type": "dart",
+      "program": "lmobile-apps/staff-app/lib/main_dev.dart",
+      "flutterMode": "debug",
+      "toolArgs": ["--flavor", "staging"]
+    },
+    {
+      "name": "krow-client-application (DEV iOS)",
+      "request": "launch",
+      "type": "dart",
+      "program": "mobile-apps/client-app/lib/main_dev.dart",
+      "flutterMode": "debug",
+      "toolArgs": ["--flavor", "dev"]
+    },
+    {
+      "name": "krow-client-application (DEV Android)",
+      "request": "launch",
+      "type": "dart",
+      "program": "lmobile-apps/client-app/lib/main_dev.dart",
+      "flutterMode": "debug",
+      "toolArgs": ["--flavor", "dev"]
+    },
+    {
+      "name": "krow-client-application (STAGING iOS)",
+      "request": "launch",
+      "type": "dart",
+      "program": "mobile-apps/client-app/lib/main_dev.dart",
+      "flutterMode": "debug",
+      "toolArgs": ["--flavor", "staging"]
+    },
+    {
+      "name": "krow-client-application (STAGING Android)",
+      "request": "launch",
+      "type": "dart",
+      "program": "lmobile-apps/client-app/lib/main_dev.dart",
+      "flutterMode": "debug",
+      "toolArgs": ["--flavor", "staging"]
+    },
+  ]
+}