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>

.gitignore

@@ -0,0 +1,38 @@
+# dependencies
+node_modules/
+.pnpm-store/
+
+# builds
+dist/
+build/
+.next/
+out/
+*.tsbuildinfo
+
+# rust / anchor (programs/pyre-core, later)
+target/
+.anchor/
+
+# env & secrets — NEVER commit
+.env
+.env.*
+!.env.example
+
+# logs
+*.log
+logs/
+npm-debug.log*
+pnpm-debug.log*
+
+# test / coverage
+coverage/
+.vitest/
+
+# editor / os
+.DS_Store
+.idea/
+.vscode/*
+!.vscode/extensions.json
+
+# serena (keep project memories, ignore local cache)
+.serena/cache/