fix(indexer): complete soroban RPC circuit breaker and resolve compiler errors

[aabxtract]

Description

Closes #148

This PR completes the implementation of the Soroban RPC Circuit Breaker in the indexer service, which prevents the application from endlessly spamming failing RPC endpoints. It also resolves a series of critical TypeScript compiler errors and syntax issues left behind by an incomplete refactoring, ensuring the application successfully builds and operates as expected.

Key Changes:
Completed Circuit Breaker Logic (indexer.ts):
Added the missing circuitBreaker.onSuccess() triggers after successful RPC interactions (getLatestLedger and getEvents). The circuit breaker will now correctly transition back from HALF_OPEN to CLOSED upon a successful probe attempt.

Fixed API Endpoint Syntax & Logic (index.ts):
POST /api/streams: Restored missing user authorization validation.
POST /api/streams/:id/cancel: Fixed incomplete try-catch block and implemented the missing cancelStream() invocation.
PATCH /api/streams/:id/start-time: Completed validation logic to guarantee newStartAt dates are in the future.
Cleaned up duplicate variable definitions and imports.

TypeScript & SDK Compatibility (streamStore.ts & auth.ts):
Replaced the deprecated/missing rpc.Api.GetAccountResponse reference with the updated Account type from @stellar/stellar-sdk to fix type-checking errors.
Corrected jwt.sign() to use the proper getJwtSecret() helper.
Fixed invalid requestId properties in the sendApiError parameters.

Formatting Fixes:
Repaired a malformed 400 response object inside the OpenAPI definitions (swagger.ts).
Removed dangling brackets causing syntax errors in the test suite (index.test.ts).

Verification
Verified npx tsc --noEmit runs with 0 compilation errors.
Confirmed /api/metrics successfully exposes the indexer circuit breaker state.
Verified all streams endpoints logic is intact and validation errors format correctly.

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