escalations and approvals commands crash: still calling removed DB functions

[nikrich]

Bug

All hive escalations and hive approvals subcommands crash with removed DB function errors:

Affected commands:

• hive escalations list → getPendingEscalations() removed
• hive escalations show <id> → getEscalationById() removed
• hive escalations acknowledge <id> → getEscalationById() removed
• hive approvals list → getPendingHumanEscalations() removed
• hive approvals show <id> → getEscalationById() removed
• hive approvals approve <id> → (likely same)
• hive approvals deny <id> → (likely same)

Error

Error: getPendingEscalations() removed — use CodeshipClient API instead
    at file:///app/dist/types/db-types.js:47:11
    at file:///app/dist/cli/commands/escalations.js:16:21

Root Cause

Same pattern as #655 — these commands still use the old direct-DB accessor functions that have been replaced with throwing stubs. They need to be migrated to use the CodeshipClient API.

Additional Note

The corresponding API endpoints also don't exist yet:

• GET /escalations → 404
• GET /approvals → 404

So even after the CLI is updated, the API backend needs these endpoints implemented.