perf,feat(events),hardening: second review pass

Fleet overview N+1:
- InstanceResourceService gains a 30s TTL cache with single-flight
  coalescing; the overview no longer fires six live upstream requests per
  device on every render (plus the re-login storm), while the per-device
  detail route probes live via force:true

Event journal becomes live:
- job terminal transitions (manual executions and the interrupted sweep)
  now append to the journal, so /api/v1/events SSE feeds the frontend's
  invalidation controller that was built but never received events
- journal pruning moves off the append hot path (was an unindexable
  full-table json_extract scan per insert) onto the retention timer

Console auth hardening:
- scrypt upgraded from N=16384 to N=2^16 (OWASP interactive guidance);
  a new password_kdf column records the derivation per row and legacy
  hashes rehash transparently on the next successful login without
  invalidating sessions (migration 18)

Legacy stack:
- instance URL validation blocks IPv4-compatible IPv6 after WHATWG
  canonicalization (::a9fe:a9fe metadata, ::7f00:1 loopback slipped past)
- status polls cool down auto-login for 60s after a failed attempt so a
  stale saved password cannot hammer the device into an account lockout

Build hygiene:
- web bundle splits app (410kB) from vendor (212kB) so framework code
  stays cacheable across releases; stale root package-lock.json removed
  (pnpm is the only lockfile)

apps/api/src/infrastructure/database/migrations.ts

@@ -670,6 +670,16 @@ export const MIGRATIONS: readonly Migration[] = [
       'CREATE INDEX idx_device_identities_imei ON device_identities(imei, instance_id)',
     ],
   },
+  {
+    id: 18,
+    name: 'console-auth-scrypt-params',
+    statements: [
+      // Legacy hashes were derived with N=16384; new derivations use stronger
+      // parameters. The column records the derivation per row; NULL means legacy
+      // and is transparently upgraded after the next successful login.
+      'ALTER TABLE console_auth_config ADD COLUMN password_kdf TEXT',
+    ],
+  },
 ];
 
 const createMigrationsTable = `CREATE TABLE schema_migrations (