refactor: DB schema fixes + container renames + compose include + audit sprint

- FindingsLedger: change schema from public to findings (V3-01)
- Add 9 migration module plugins: RiskEngine, Replay, ExportCenter, Integrations, Signer, IssuerDirectory, Workflow, PacksRegistry, OpsMemory (V4-01 to V4-09)
- Remove 16 redundant inline CREATE SCHEMA patterns (V4-10)
- Rename export→export-web, excititor→excititor-web for consistency
- Compose stella-ops.yml: thin wrapper using include: directive
- Fix dead /api/v1/jobengine/* gateway routes → release-orchestrator/packsregistry
- Scheduler plugin architecture: ISchedulerJobPlugin + ScanJobPlugin + DoctorJobPlugin
- Create unified audit sink sprint plan
- VulnExplorer integration tests + gap analysis

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Web/StellaOps.Web/src/app/core/config/app-config.service.spec.ts

@@ -41,7 +41,7 @@ describe('AppConfigService', () => {
         apiBaseUrls: {
           gateway: 'http://router.stella-ops.local',
           scanner: 'http://scanner.stella-ops.local',
-          policy: 'http://policy-gateway.stella-ops.local',
+          policy: 'http://policy-engine.stella-ops.local',
           concelier: 'http://concelier.stella-ops.local',
           attestor: 'http://attestor.stella-ops.local',
           authority: 'http://authority.stella-ops.local',