feat: explorer API, wallet, CCIP scripts, and config refresh

- Backend REST/gateway/track routes, analytics, Blockscout proxy paths.
- Frontend wallet and liquidity surfaces; MetaMask token list alignment.
- Deployment docs, verification scripts, address inventory updates.

Check: go build ./... under backend/ (pass).
Made-with: Cursor

docs/TIERED_ARCHITECTURE_SETUP.md

@@ -26,9 +26,9 @@ cd backend
 
 ### Required
 - `DB_HOST` - PostgreSQL host (default: localhost)
-- `DB_USER` - Database user (default: explorer)
+- `DB_USER` - Database user (default: explorer; use `blockscout` for the shared Blockscout DB mode)
 - `DB_PASSWORD` - Database password (default: changeme)
-- `DB_NAME` - Database name (default: explorer)
+- `DB_NAME` - Database name (default: explorer; use `blockscout` for the shared Blockscout DB mode)
 
 ### Recommended (Production)
 - `JWT_SECRET` - Strong random secret for JWT signing (required for production)
@@ -38,17 +38,18 @@ cd backend
 
 ## Database Migration
 
-Run the Track 2-4 schema migration:
+Run the migration helper:
 
 ```bash
 bash scripts/run-migration-0010.sh
 ```
 
-This creates:
-- Track 2 tables: `addresses`, `token_transfers`, `token_balances`, `internal_transactions`
-- Track 3 tables: `analytics_flows`, `analytics_bridge_history`, `token_distribution` (materialized view)
-- Track 4 tables: `operator_events`, `operator_ip_whitelist`, `operator_roles`
-- Auth table: `wallet_nonces`
+The helper auto-detects the database layout:
+
+- **Standalone explorer DB**: creates the full Track 2-4 schema
+- **Shared Blockscout DB**: creates only `operator_events`, `operator_ip_whitelist`, `operator_roles`, and `wallet_nonces`
+
+Do **not** apply `backend/database/migrations/0010_track_schema.up.sql` directly to the shared Blockscout DB.
 
 ## User Management
 
@@ -152,11 +153,13 @@ The indexers will:
 ### Migration Fails
 - Check database connection: `psql -h $DB_HOST -U $DB_USER -d $DB_NAME -c "SELECT 1"`
 - Verify user has CREATE TABLE permissions
+- If you are using the shared Blockscout DB, keep `DB_USER` and `DB_NAME` aligned to `blockscout`
 
 ### Authentication Fails
 - Check JWT_SECRET is set
 - Verify wallet_nonces table exists
 - Check database connection in auth handlers
+- If the wallet popup shows `Nonce: undefined`, the nonce request failed before signing. Run `bash scripts/run-migration-0010.sh`, restart the backend, and retry.
 
 ### Track Routes Not Working
 - Verify user is approved: Check `operator_roles` table
@@ -179,4 +182,3 @@ The indexers will:
 7. ✅ Verify feature gating
 
 For detailed API documentation, see: `docs/api/track-api-contracts.md`
-