fix: Schema alignment and code corrections (COA 2)

- Replace owner_id → owner_user_id in all queries
- Replace auth_token → companion_agent_token in server_connections
- Replace l.active → (l.status = 'active') checks using ENUM
- Fix AppError → ApiError in all new API files
- Add missing imports (Path, PanelAdapter trait)
- Fix StoreConfig nullable type mismatches

Resolves 122 compilation errors. Only sqlx cache generation remains.

Phase 3: EXECUTE complete per V4_WORKFLOW

PHASE456_AUDIT.md

@@ -0,0 +1,113 @@
+# Phase 4/5/6 Audit Report
+
+## SITUATION
+Agents delivered Phase 4/5/6 code without verifying schema compatibility. Compilation fails with 122 errors.
+
+## ROOT CAUSE ANALYSIS
+
+### 1. SCHEMA MISMATCHES
+
+#### `licenses` table
+- **Missing:** `active` BOOLEAN column
+- **Mismatch:** Code uses `owner_id`, actual column is `owner_user_id`
+- **Impact:** B2B host provisioning queries fail
+
+#### `server_connections` table
+- **Missing:** `auth_token` VARCHAR column
+- **Actual:** Column is `companion_agent_token`
+- **Impact:** Host provisioning can't store companion tokens
+
+#### `notifications_config` vs `public_site_config`
+- Code queries `public_site_config.discord_webhook_url`
+- **Actual:** `discord_webhook_url` is in `notifications_config` table
+- **Impact:** db/notifications.rs and db/public.rs queries fail
+
+### 2. CODE ERRORS
+
+#### Import Errors
+**File:** `backend/src/api/webstore.rs`
+- Uses `AppError` — should be `ApiError`
+- Uses `middleware::jwt::Claims` — should verify path exists
+
+**File:** `backend/src/api/public_store.rs`
+- Uses `AppError` — should be `ApiError`
+
+**File:** `backend/src/api/host.rs`
+- Uses `AppError` — should be `ApiError`
+- Missing import: `use axum::extract::Path;`
+
+**File:** `backend/src/services/module_installer.rs`
+- Missing trait import: `use crate::services::panel_adapter::PanelAdapter;`
+- Causes `put_file()` and `send_command()` method not found errors
+
+#### Type Mismatches
+**File:** `backend/src/api/webstore.rs` (line 287)
+- `StoreConfig` struct expects non-nullable fields
+- Database `store_config` columns are nullable
+- **Fix:** Use `Option<String>` and `Option<bool>` in struct
+
+### 3. MIGRATION GAPS
+
+#### Existing Migrations (Applied)
+✅ 001_initial_schema.sql — Core tables
+✅ 002_early_access_signups.sql
+✅ 003_super_admin.sql
+✅ 005_map_analytics.sql
+✅ 006_player_sessions.sql
+✅ 007_status_page_description.sql
+✅ 008_alert_system.sql — Creates alert_config, alert_history
+✅ 009_module_licensing.sql — Creates modules, module_purchases, module_installations
+✅ 010_payment_orders.sql
+✅ 011_webstore_tables.sql — Creates webstore_subscriptions, store_config, store_categories, store_items, store_transactions
+✅ 012_b2b_hosts.sql — Creates hosts, host_licenses, host_billing_records
+
+#### Required New Migration
+📝 **013_schema_fixes.sql** — Add missing columns:
+- `licenses.active` BOOLEAN DEFAULT true
+- `licenses.owner_id` as alias/migrate from `owner_user_id`
+- `server_connections.auth_token` as alias/migrate from `companion_agent_token`
+
+## BLAST RADIUS
+
+### Broken Files (Won't Compile)
+1. backend/src/api/webstore.rs (7 errors)
+2. backend/src/api/public_store.rs (1 error)
+3. backend/src/api/host.rs (4 errors)
+4. backend/src/services/module_installer.rs (6 errors)
+5. backend/src/services/host_provisioning.rs (3 errors)
+6. backend/src/services/subscription_processor.rs (1 warning)
+7. backend/src/db/notifications.rs (1 error)
+8. backend/src/db/public.rs (3 errors)
+9. backend/src/db/alerts.rs (9 errors - these are false positives, tables exist)
+
+### Impact Assessment
+- **Critical:** Cannot build Docker image
+- **Moderate:** 122 compilation errors blocking deployment
+- **Low:** Once fixed, runtime should work (migrations already applied to DB)
+
+## FIXES REQUIRED
+
+### Category A: Schema Fixes (Migration 013)
+1. Add `licenses.active` column
+2. Add `licenses.owner_id` column OR update all queries to use `owner_user_id`
+3. Add `server_connections.auth_token` column OR update all queries to use `companion_agent_token`
+
+### Category B: Code Fixes
+1. Replace `AppError` with `ApiError` (3 files)
+2. Add missing imports (2 files)
+3. Fix nullable type mismatches (1 file)
+4. Fix query column references (4 files)
+
+### Category C: Verification
+1. Rebuild with `cargo check`
+2. Generate sqlx cache
+3. Docker build test
+4. Runtime smoke test
+
+## RECOMMENDATION
+**Fix forward, not rollback.** All migrations are applied. Code fixes + one new migration will resolve.
+
+**ETA:** 45 minutes
+- 15 min: Write migration 013
+- 20 min: Fix code errors
+- 10 min: Test compilation + generate sqlx cache