chore(build): add clean-build script for troubleshooting

Adds a comprehensive clean script that removes all build artifacts,
caches, and dependencies to help reproduce build issues across
different development environments.

The script cleans:
- TypeScript build output (dist/)
- iOS plugin artifacts (Pods, Podfile.lock, build dirs)
- Android plugin artifacts (build dirs, optional .gradle cache)
- Test app artifacts (node_modules, dist/, iOS/Android builds)
- Optional: Xcode DerivedData, Gradle cache, node_modules reinstall

Usage:
  ./scripts/clean-build.sh              # Basic clean
  ./scripts/clean-build.sh --all        # Full clean with reinstall

This is particularly useful when troubleshooting build failures
that may be environment-specific (different Xcode, CocoaPods,
macOS, or Node versions).

ios/Podfile.lock

@@ -1,29 +0,0 @@
-PODS:
-  - Capacitor (6.2.1):
-    - CapacitorCordova
-  - CapacitorCordova (6.2.1)
-  - DailyNotificationPlugin (1.0.0):
-    - Capacitor (>= 5.0.0)
-    - CapacitorCordova (>= 5.0.0)
-
-DEPENDENCIES:
-  - "Capacitor (from `../node_modules/@capacitor/ios`)"
-  - "CapacitorCordova (from `../node_modules/@capacitor/ios`)"
-  - DailyNotificationPlugin (from `.`)
-
-EXTERNAL SOURCES:
-  Capacitor:
-    :path: "../node_modules/@capacitor/ios"
-  CapacitorCordova:
-    :path: "../node_modules/@capacitor/ios"
-  DailyNotificationPlugin:
-    :path: "."
-
-SPEC CHECKSUMS:
-  Capacitor: c95400d761e376be9da6be5a05f226c0e865cebf
-  CapacitorCordova: 8d93e14982f440181be7304aa9559ca631d77fff
-  DailyNotificationPlugin: bb72fde9eab3704a4e70af3c868a789da0650ddc
-
-PODFILE CHECKSUM: ac8c229d24347f6f83e67e6b95458e0b81e68f7c
-
-COCOAPODS: 1.16.2