feat: architecture refactor — core layer, spreadsheet engine, envelope bidding, tests

- Add src/core/ (config, errors, events, http, observability, storage, query)
- Add src/Spreadsheet/ engine with native POI backend and Excel bridge
- Add Envelope C spreadsheet flow and tender bidding envelope modules
- Consolidate components into src/components/, remove legacy Component/ and Hooks/
- Add registration state/validation, auth session guard, profile edit modules
- Add unit tests across axios, redux, bidding, registration, encryption, core
- Add CI workflow, docs (architecture, audit, DSC API spec), keystore example
- Remove tracked keystore binary; ignore scripts.zip

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/Constant/NavigationString.tsx

@@ -24,8 +24,8 @@ const NavigationString = {
     ResetPassword:'ResetPassword',
     KycWebViewScreen:'KycWebViewScreen',
     StageThreeScreen:'StageThree',
-    DecryptionScreen:'DecryptionScreen',
     DeviceBinding: 'DeviceBinding',
-    DscBinding: 'DscBinding'
-}
-export default NavigationString
+    DscBinding: 'DscBinding',
+    EnvelopeCSpreadsheet: 'EnvelopeCSpreadsheet'
+} as const
+export default NavigationString