refactor(P2): standardize API responses + fix migrations + cleanup DI
Wave 3 — 3 parallel agents fixing P2 code quality issues:
Response format standardization (30 controllers across 8 services):
- Wrapped all raw DTO returns with { success: true, data: result }
- Standardized error responses with { success: false, error: { code, message } }
- Services: chat, social, membership, ads-manager, ads-serving,
ads-billing, ads-tracking, ads-analytics
- booking-service already compliant (skipped)
Migration fixes:
- ads-billing: Fixed InvoiceId1 spurious FK (explicit HasMany navigation)
- Removed unused IRequestManager DI from: ads-analytics, ads-serving,
booking, mkt-facebook (classes preserved for future use)
Unused dependencies:
- No Redis/Dapper DI registrations found (only NuGet refs, kept as-is)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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