fix(cli): reduce token consumption by fetching only needed issue fields

Changes

• Add PostgREST select parameter to fetch only needed fields from issues API
• Exclude action_items from issue detail — duplicates SQL content already present in description
• fetchIssues (list): returns only id, title, status, created_at
• fetchIssue (detail): returns only id, title, description, status, created_at, author_display_name - omit action_items from request
• Add TypeScript interfaces for type safety
• Fix CI: add DOCKER_API_VERSION for dind compatibility

Benefits

• Significantly reduced API response size for MCP tools
• Lower LLM token consumption — no more duplicate content (action_items ≈ description SQL blocks)
• Faster API responses — less data transferred