Implement BWTYA API endpoints and background jobs

[railway-app]

Summary

Replaces all stubbed mock responses with fully functional implementations across every endpoint. The API is restructured into a clean src/ module tree: lib/ for shared utilities, routes/ for Express handlers, middleware/ for cross-cutting concerns, jobs/ for cron tasks, and db/ for the Supabase schema.

POST /v1/market fetches live Base chain TVL from DefiLlama and the Fear & Greed Index from alternative.me, with a 5-second Supabase cache and stale fallback. POST /v1/scripture-match generates OpenAI embeddings and runs pgvector cosine similarity against biblical_knowledge_base. GET|POST|PUT|DELETE /v1/churches is a full CRUD API with Google Maps address verification, JWT auth on write operations, and soft deletes. GET|POST|DELETE /v1/streams creates and stops real Superfluid CFA streams on Base via Viem. POST /x402 implements the HTTP 402 payment protocol — returns payment requirements when no header is present, verifies EIP-191 signatures when one is. POST /mcp speaks JSON-RPC 2.0 Model Context Protocol with tools/list and tools/call. POST /a2a implements Agent-to-Agent with ERC-8004 signature verification and action routing.

Four background jobs run via node-cron and setInterval: market cache refresh every 5 seconds, scripture embedding seeding hourly, church address re-verification hourly (offset 30 min), and validator reward calculation every 15 minutes via Superfluid GDA pool units. Middleware adds per-IP rate limiting (100 req/min global, 20 req/min on expensive endpoints), structured CORS for the Railway frontend, request logging, and a global error handler. src/db/schema.sql contains the complete Supabase DDL including the match_scriptures pgvector RPC function, and .env.example documents all required environment variables.

Changes

• Created src/lib/supabase.js
• Created src/lib/openai.js
• Created src/lib/defillama.js
• Created src/lib/superfluid.js
• Created src/lib/churches.js
• Created src/lib/auth.js
• Created src/lib/scripture.js
• Created src/routes/market.js
• Created src/routes/scripture.js
• Created src/routes/churches.js
• Created src/routes/mcp.js
• Created src/routes/streams.js
• Created src/routes/x402.js
• Created src/routes/a2a.js
• Created src/jobs/index.js
• Created src/db/schema.sql
• Created src/middleware/index.js
• Modified index.js
• Modified package.json
• Created .env.example

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