feat(CF-762): Complete Jira migration - consolidate projects, cleanup

- Remove task CRUD/epic/search/relation/version tools (moved to Jira)
- Add migration scripts: migrate-tasks-to-jira, jira-admin, prepare-all-projects
- Add consolidate-projects.ts for merging duplicate Jira projects
- Add validate-migration.ts for post-migration integrity checks
- Add jira_issue_key columns migration (030)
- Consolidate 11 duplicate projects (LIT→LITE, CARD→CS, etc.)
- Delete 92 placeholder issues, 11 empty source projects
- Remove SG project completely
- 2,798 tasks migrated across 46 Jira projects

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

.env.example

@@ -1,7 +1,7 @@
 # Task MCP Environment Variables
 
 # PostgreSQL connection via pgbouncer
-POSTGRES_HOST=infra.agiliton.internal
+POSTGRES_HOST=postgres.agiliton.internal
 POSTGRES_PORT=6432
 
 # Embedding service configuration