feat(sessions): indexação multi-fonte Hermes + OpenCode com fix TypeScript

- Novos indexadores hermes-indexer.ts e opencode-indexer.ts para unificar
  sessões Claude, Hermes Agent e OpenCode num único sessions.db
- SessionMeta alargado: source (obrigatório), model, input/output_tokens,
  estimated_cost; project_path/jsonl_path agora nullable
- Fix TS: tipos explícitos, guard jsonl_path null, dependências instaladas

Security Audit (Regra #47):
- npm audit executado — 0 vulnerabilities após fix
- vite 7→8.0.16 (breaking upgrade, resolve esbuild CVE GHSA-gv7w-rqvm-qjhr)
- vitest 4.0.18→4.1.9 (resolve esbuild interno CVE GHSA-gv7w-rqvm-qjhr)
- shell-quote override ^1.8.4 via package.json#overrides (CVE GHSA-w7jw-789q-3m8p)
- react-router, joi, qs, form-data, ip-address, js-yaml resolvidos via npm audit fix

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/tests/sessions-db.test.ts

@@ -8,6 +8,11 @@ import type { SessionMeta } from '../types/session.js'
 function sampleMeta(overrides: Partial<SessionMeta> = {}): SessionMeta {
   return {
     session_id: 's1',
+    source: 'claude',
+    model: null,
+    input_tokens: null,
+    output_tokens: null,
+    estimated_cost: null,
     project_path: '/tmp/project',
     project_slug: 'project',
     jsonl_path: '/tmp/project/s1.jsonl',