chore: drop Sora database schema and regenerate ent code

backend/migrations/090_drop_sora.sql

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+-- Migration: 090_drop_sora
+-- Remove all Sora-related database objects.
+-- Drops tables: sora_tasks, sora_generations, sora_accounts
+-- Drops columns from: groups, users, usage_logs
+
+-- ============================================================
+-- 1. Drop Sora tables
+-- ============================================================
+DROP TABLE IF EXISTS sora_tasks;
+DROP TABLE IF EXISTS sora_generations;
+DROP TABLE IF EXISTS sora_accounts;
+
+-- ============================================================
+-- 2. Drop Sora columns from groups table
+-- ============================================================
+ALTER TABLE groups
+    DROP COLUMN IF EXISTS sora_image_price_360,
+    DROP COLUMN IF EXISTS sora_image_price_540,
+    DROP COLUMN IF EXISTS sora_video_price_per_request,
+    DROP COLUMN IF EXISTS sora_video_price_per_request_hd,
+    DROP COLUMN IF EXISTS sora_storage_quota_bytes;
+
+-- ============================================================
+-- 3. Drop Sora columns from users table
+-- ============================================================
+ALTER TABLE users
+    DROP COLUMN IF EXISTS sora_storage_quota_bytes,
+    DROP COLUMN IF EXISTS sora_storage_used_bytes;
+
+-- ============================================================
+-- 4. Drop Sora column from usage_logs table
+-- ============================================================
+ALTER TABLE usage_logs
+    DROP COLUMN IF EXISTS media_type;