chore: scaffold PYRE MVP monorepo (structure + docs)

pnpm + TypeScript workspace per design doc §13:
- apps/{web,api,worker} skeletons (Next.js 16, Fastify 5, BullMQ)
- packages/{core,solana,prometheus,db,config} (core has real types/DTOs;
  solana/prometheus are stubs)
- programs/pyre-core placeholder (future Anchor, v1.0)
- docs/: PYRE_MVP_DESIGN (canonical), ARCHITECTURE, SECURITY, TOKEN_CLASSIFICATION
- CLAUDE.md, README, .env.example (no private-key var by design)

Skeleton + docs only — no Solana/business logic yet. All workspaces typecheck clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/db/README.md

@@ -0,0 +1,44 @@
+# @pyre/db
+
+Database schema, migrations, and table definitions for PYRE (PostgreSQL).
+
+## Purpose
+
+Per §13: the schema, migrations, and table definitions. Uses `pg` for
+connectivity. Connection details come from `DATABASE_URL` via `@pyre/config` —
+**never** hardcode credentials.
+
+## Tables (§15)
+
+### Initial MVP tables
+
+- `wallet_scans` — id, wallet, status, created_at, completed_at, summary_json
+- `token_accounts` — id, scan_id, wallet, ata, mint, token_program, raw_balance,
+  ui_balance, decimals, symbol, name, classification, warnings_json,
+  estimated_rent_lamports, created_at
+- `cleanup_receipts` — id, wallet, scan_id, tx_signature, rent_returned_lamports,
+  closed_accounts_count, burned_tokens_count, status, created_at, receipt_json
+- `prometheus_generations` — id, receipt_id, input_json, output_json, status,
+  risk_flags_json, created_at, approved_at, rejected_at
+- `spawn_records` — id, generation_id, spawn_name, ticker, mint, metadata_uri,
+  pumpfun_url, launch_tx, status, created_at
+
+### Future tables
+
+- `token_classifications`
+- `burn_events`
+- `close_account_events`
+- `spawn_candidates`
+- `system_events`
+
+## Status
+
+**Skeleton.** Exports table-name constants and a connection-factory stub. No
+queries, no schema DDL, no migrations yet.
+
+## TODO
+
+- Implement the `createPool()` connection factory (read `DATABASE_URL` via
+  `@pyre/config`).
+- Add SQL migrations under `migrations/` and a migration runner.
+- Add typed table definitions and a query layer.