Resolve issues #249, #281, #267, #279

[brightcli-stack]

This PR resolves issues #249, #281, #267, and #279.

Proposed Changes

1. Implement indexer REST API: GET /invoices (Closes #249)

• Extended GET /invoices router in indexer/src/api/routes/invoices.ts to support pagination (page, pageSize), filters (state, token, submitter), and sorting (sortBy, sortOrder by createdAt, dueDate, amount, and discountRate).
• Added the required Cache-Control: max-age=10 header.
• Added comprehensive unit tests in indexer/tests/invoices.test.ts.

2. Per-Address Event Feed Endpoint: GET /events (Closes #267)

• Created the new router indexer/src/api/routes/events.ts and registered it in indexer/src/app.ts.
• Implemented GET /events?address=... filtering which joins events and invoices tables to return events where the address is the freelancer, payer, or funder. Supports pagination and type filtering (e.g. types=InvoiceFunded,InvoicePaid).
• Added database indexes on the freelancer, payer, and funder columns of the invoices table to optimize queries.
• Added corresponding unit tests in indexer/tests/events.test.ts.

3. E2E Test: Reputation System Lifecycle (Closes #281)

• Created tests/e2e/reputation.test.ts to verify the E2E lifecycle of the reputation score system (submitting/paying 5 invoices results in score 100, letting 2 expire results in score ~33, verifying indexer GET /reputation/:address reflects the correct score and history).

4. E2E Test: Full Invoice Lifecycle (Closes #279)

• Created tests/e2e/lifecycle.test.ts to execute a full submit -> fund -> pay lifecycle using the SDK against Stellar testnet and verify that the indexer reflects the state change within 10 seconds.

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