Security, Performance Optimization and Quality updates

Security Improvements

- Database Security: Fixed function search_path mutable warning

- Added SET search_path to update_route_optimizer_updated_at() function for security

- RLS Policies: Replaced overly permissive policies with proper validation

- changelog_entries: Changed from WITH CHECK (true) to admin role validation

- companies: Added company name validation on INSERT

- industrial_properties: Added lister_id validation on INSERT

- property_inquiries: Added required field validation for anonymous inserts

- RLS Policy Performance: Optimized 67+ RLS policies across 22 tables

- Replaced auth.uid() with (select auth.uid()) to prevent re-evaluation per row

- Auth context now evaluated once per query instead of per row

- Significant performance improvement on tables with large datasets

- Database Indexes: Removed duplicate index on commitment_daily_snapshots

- Supabase Advisor: Resolved all warnings (0 warnings remaining)

- All security warnings fixed

- All performance warnings fixed

- Database now fully optimized and compliant