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/Services/ApiCall/ApiUrls.tsx

@@ -1,8 +1,8 @@
-// const BASE_URL = `http://192.168.6.194:8090/`
-const BASE_URL = `https://eproc.godemo.in/`
-// const BASE_URL = `http://192.168.6.194/AuctionPostgre/api/auction/`
-// export const BASE_URL = `https://procurelinc.in/Auction/`
-// const BASE_URL = `http://192.168.29.226:8090/`
+import { env } from '../../core/config/env'
+
+// Endpoint catalog for the eproc REST backend. The host comes from the
+// environment config — never hardcode or comment-swap hosts here.
+const BASE_URL = env.apiBaseUrl
 const GET_DESIGNATION = `${BASE_URL}contractor/getAllDesignationContractor`
 const SAVE_CONTRACTOR_STAGE1 = `${BASE_URL}contractor/registerContractorStage1`
 const GET_CONTRACTOR_CLASS = `${BASE_URL}contractor/allContractorClassSecond`