fix(sdk): point MissingTrustlineError at /api/v1/tx/add-trustline

[solaawojobi00-bit]

fix(sdk): point MissingTrustlineError at /api/v1/tx/add-trustline

Problem

MissingTrustlineError tells API clients to call POST /api/v1/tx/trustline, a route that does not exist. api/v1/tx/[action].ts maps "add-trustline" and returns 404 for any other action, so a client following the message gets a 404.

Scenario	Before	After
One missing trustline	"...via POST /api/v1/tx/trustline..." (404)	"...via POST /api/v1/tx/add-trustline..."
Several missing trustlines	"...via POST /api/v1/tx/trustline..." (404)	"...via POST /api/v1/tx/add-trustline..."

Solution

Correct both message variants to name the route the API actually serves.

Changes

• packages/stellar-sdk-helpers/src/tx.ts: both message strings now use /api/v1/tx/add-trustline.
• packages/api-core/src/tx.test.ts: the two assertions on the message text now expect the corrected route.

Regression Tests

Acceptance criterion	Test
Error text names the route the API serves	packages/api-core/src/tx.test.ts (two message assertions, updated)
Tests asserting the message are updated	same file
helpers tests and typecheck pass	see Testing

Testing

pnpm --filter @meridian/stellar-sdk-helpers test
 Test Files  23 passed (23)
      Tests  522 passed (522)

pnpm --filter @meridian/api-core test
 Test Files  5 passed (5)
      Tests  73 passed (73)

pnpm typecheck
 Tasks:    12 successful, 12 total

Notes for Reviewers

Text-only change; no behavior or API surface change. api-core resolves helpers through dist, so rebuild helpers before running its tests.

Closes #1103

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