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/schemas/jira_schema.py

@@ -0,0 +1,46 @@
+"""Pydantic schemas for Jira integration endpoints."""
+
+from datetime import datetime
+from typing import Optional
+from uuid import UUID
+
+from pydantic import BaseModel, Field
+
+from app.models.jira_link import JiraLinkEntityType, JiraSyncDirection
+
+
+class JiraLinkCreate(BaseModel):
+    entity_type: JiraLinkEntityType
+    entity_id: UUID
+    jira_issue_key: str = Field(..., pattern=r"^[A-Z][A-Z0-9]+-\d+$")
+    sync_direction: JiraSyncDirection = JiraSyncDirection.bidirectional
+
+
+class JiraLinkOut(BaseModel):
+    id: UUID
+    entity_type: JiraLinkEntityType
+    entity_id: UUID
+    jira_issue_key: str
+    jira_issue_id: Optional[str] = None
+    jira_project_key: Optional[str] = None
+    jira_status: Optional[str] = None
+    jira_priority: Optional[str] = None
+    jira_assignee: Optional[str] = None
+    jira_story_points: Optional[str] = None
+    last_synced_at: Optional[datetime] = None
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class JiraIssueSearch(BaseModel):
+    query: str
+
+
+class JiraIssueResult(BaseModel):
+    issue_key: str
+    summary: str
+    status: str
+    assignee: Optional[str] = None
+    priority: Optional[str] = None