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

backend/src/services/host_provisioning.rs

@@ -52,7 +52,7 @@ impl HostProvisioningService {
 
         // Create license
         let license_id = sqlx::query_scalar!(
-            "INSERT INTO licenses (license_key, owner_id, server_name, subdomain)
+            "INSERT INTO licenses (license_key, owner_user_id, server_name, subdomain)
              VALUES ($1, $2, $3, $4)
              RETURNING id",
             license_key,
@@ -79,9 +79,9 @@ impl HostProvisioningService {
 
         // Store companion token
         sqlx::query!(
-            "INSERT INTO server_connections (license_id, connection_type, auth_token)
+            "INSERT INTO server_connections (license_id, connection_type, companion_agent_token)
              VALUES ($1, 'bare_metal', $2)
-             ON CONFLICT (license_id) DO UPDATE SET auth_token = $2",
+             ON CONFLICT (license_id) DO UPDATE SET companion_agent_token = $2",
             license_id,
             companion_token
         )
@@ -150,7 +150,7 @@ impl HostProvisioningService {
         let count = sqlx::query_scalar!(
             "SELECT COUNT(*) FROM host_licenses hl
              INNER JOIN licenses l ON l.id = hl.license_id
-             WHERE hl.host_id = $1 AND l.active = true",
+             WHERE hl.host_id = $1 AND l.status = 'active'",
             host_id
         )
         .fetch_one(&self.db)

backend/src/services/module_installer.rs

@@ -6,6 +6,7 @@ use uuid::Uuid;
 use super::amp_adapter::AmpAdapter;
 use super::encryption;
 use super::nats_bridge::NatsBridge;
+use super::panel_adapter::PanelAdapter;
 use super::pterodactyl_adapter::PterodactylAdapter;
 
 /// Default timeout for module installation operations (60 seconds).