fix(api): map workspace package paths to source in api tsconfig (#956)

[Ranjeet2063]

Closes #956

Summary of Changes

Decouples Vercel's serverless function type-checking () from emitted declaration files by adding explicit path mappings in directly to the live workspace package sources.

Background & Root Cause

Production Vercel deployments were failing in the serverless function type-check phase with errors such as:

api/v1/vaults/index.ts(2,10): error TS2305: Module '"@meridian/api-core"' has no exported member 'handleGetVaults'.
api/v1/vaults/index.ts(3,10): error TS2305: Module '"@meridian/shared"' has no exported member 'APP_NETWORK'.
api/_lib/middleware.ts(3,10): error TS2305: Module '"@meridian/shared"' has no exported member 'DEFAULT_ALLOWED_ORIGIN'.

While CI passes cleanly, Vercel restores packages/*/dist from previous deployment caches. If @vercel/node runs its independent tsc over api/** against stale .d.ts declarations, newly introduced exports fail to resolve.

Implementation Details

• Configured paths in api/tsconfig.json:
  • @meridian/shared -> ["../packages/shared/src/index.ts"]: Points directly to shared schemas and constants.
  • @meridian/api-core -> ["../packages/api-core/src/index.ts"]: Points to core API handlers.
  • @meridian/stellar-sdk-helpers -> ["../packages/stellar-sdk-helpers/src/index.ts"]: Points to keeper, rate source, and sdk helper sources.
• Runtime bundling remains unaffected as esbuild resolves dist/index.js via each package's main.

Local Verification

1. Isolated No-Dist Test:
   • Manually removed packages/shared/dist, packages/api-core/dist, and packages/stellar-sdk-helpers/dist.
   • Executed pnpm typecheck:api -> Passed with 0 errors, confirming that typechecking no longer depends on emitted declarations.
2. Full Workspace Build & Verification:
   • pnpm build: 10/10 tasks successful (wasm contracts, sdk, web, apps).
   • pnpm typecheck: 12/12 packages passed cleanly.
   • pnpm typecheck:api: Passed cleanly.
   • pnpm lint: All packages passed without lint warnings.
   • pnpm test: 40 test files passed (335/335 unit tests passing).

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