feat(phase1): wallet scanner — scan API, classifier, token fetch, web UI

- @pyre/core: conservative classifier (classifyTokenAccount) + types + risk
  constants. EMPTY only when truly empty + classic-SPL + not frozen/delegated;
  Token-2022/unknown → UNSUPPORTED; frozen/delegated/NFT/valuable/over-threshold
  → PROTECTED_SKIP; TRANSMUTABLE only via explicit route hook (none in MVP).
  43 unit tests incl. a "never says safe" assertion.
- @pyre/solana: parseTokenAccounts (SPL + Token-2022 detection, NFT heuristic,
  rent, defensive owner cross-check) + tests. Tx builders remain Phase-2 stubs.
- @pyre/config: loadConfig() from env.
- @pyre/api: POST /api/scan — validates pubkey, recomputes classification
  server-side, CORS + rate-limit; DB persistence deferred. Live-RPC smoke OK.
- @pyre/web: wallet-connect (Wallet Standard) + grouped scan UI, ember theme,
  trust wording (no "safe"); next.config transpiles @pyre/core; prod build OK.

Built by 4 agents on a locked core contract; 2 audit agents (security: SOUND;
build: 1 blocker → fixed). Stripped .js import extensions in @pyre/core so
Turbopack resolves the source package. All typecheck + tests + build green.

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

apps/web/.env.example

@@ -0,0 +1,12 @@
+# PYRE web (@pyre/web) — environment variables.
+# Copy to .env.local for local development. All vars are PUBLIC (NEXT_PUBLIC_*):
+# they are inlined into the client bundle, so put nothing secret here.
+
+# Base URL of the PYRE HTTP API (apps/api). Used for POST /api/scan.
+# Defaults to http://localhost:4000 if unset.
+NEXT_PUBLIC_API_URL=http://localhost:4000
+
+# Solana RPC endpoint for the wallet ConnectionProvider.
+# Use a dedicated provider (Helius/Triton/QuickNode/etc.) in production.
+# Defaults to https://api.mainnet-beta.solana.com if unset.
+NEXT_PUBLIC_SOLANA_RPC_URL=https://api.mainnet-beta.solana.com