feat: add appointments, campaigns, admin, storage, tests and various updates

- Add new routers: admin, appointments, campaigns
- Add storage service and logging config
- Add migrations directory and test suite with pytest config
- Add supabase_migration_features.sql
- Update models, dependencies, config, and existing routers
- Remove whatsapp_service (deleted)
- Update pyproject.toml and uv.lock dependencies

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

migrations/002_messages_confidence.sql

@@ -0,0 +1,8 @@
+-- Migration 002: Add confidence_score and is_handoff to messages table
+-- Run this in Supabase SQL editor
+
+ALTER TABLE messages ADD COLUMN IF NOT EXISTS confidence_score DECIMAL(5,4);
+ALTER TABLE messages ADD COLUMN IF NOT EXISTS is_handoff BOOLEAN DEFAULT FALSE;
+
+CREATE INDEX IF NOT EXISTS idx_messages_confidence
+    ON messages(confidence_score) WHERE confidence_score IS NOT NULL;