feat(phase-35): Jira + Tempo integration with internal worklogs

Full Jira/Tempo pipeline: link Aegis entities to Jira issues, auto-sync
status hourly, log time internally with integrity hashing, and optionally
push worklogs to Tempo.

- 1.1 JiraLink model + Worklog model: Alembic migration b020 with indexes,
  enums (jiralinkentitytype, jirasyncdirection), and integrity_hash column
- 1.2 Jira service: atlassian-python-api wrapper with lazy singleton client,
  search/create/sync operations, feature-flagged via JIRA_ENABLED
- 1.3 Jira router: CRUD endpoints for /jira/links, /jira/search,
  /jira/create-issue with audit logging and entity-to-issue auto-creation
- 1.4 Tempo service: worklog push via tempo-api-python-client, auto-log from
  test completions when TEMPO_ENABLED, graceful fallback on failure
- 1.5 Worklog service + router: immutable internal time records with SHA-256
  integrity hash, CRUD at /worklogs, /worklogs/{id}/verify endpoint
- 1.6 Frontend: JiraLinkPanel component (search, link, sync, unlink) and
  WorklogTimeline component (timeline view, manual log form) integrated into
  TestDetailPage sidebar, CampaignDetailPage grid, TechniqueDetailPage
- 1.7 Jira sync job: APScheduler hourly job syncs all links from Jira,
  registered in background scheduler alongside existing jobs

backend/app/models/__init__.py

@@ -16,6 +16,8 @@ from app.models.test_detection_result import TestDetectionResult
 from app.models.campaign import Campaign, CampaignTest
 from app.models.compliance import ComplianceFramework, ComplianceControl, ComplianceControlMapping
 from app.models.coverage_snapshot import CoverageSnapshot, SnapshotTechniqueState
+from app.models.jira_link import JiraLink, JiraLinkEntityType, JiraSyncDirection
+from app.models.worklog import Worklog
 from app.models.enums import TechniqueStatus, TestState, TestResult, TeamSide
 
 __all__ = [
@@ -27,5 +29,7 @@ __all__ = [
     "Campaign", "CampaignTest",
     "ComplianceFramework", "ComplianceControl", "ComplianceControlMapping",
     "CoverageSnapshot", "SnapshotTechniqueState",
+    "JiraLink", "JiraLinkEntityType", "JiraSyncDirection",
+    "Worklog",
     "TechniqueStatus", "TestState", "TestResult", "TeamSide",
 ]