fix: resolve migration 004 transaction and executeSet errors

- Remove explicit transaction wrapping in migration service that caused
  "cannot start a transaction within a transaction" errors
- Fix executeSet method call format to include both statement and values
  properties as required by Capacitor SQLite plugin
- Update CapacitorPlatformService to properly handle multi-statement SQL
  using executeSet for migration SQL blocks
- Ensure migration 004 (active_identity_management) executes atomically
  without nested transaction conflicts
- Remove unnecessary try/catch wrapper

Fixes iOS simulator migration failures where:
- Migration 004 would fail with transaction errors
- executeSet would fail with "Must provide a set as Array of {statement,values}"
- Database initialization would fail after migration errors

Tested on iOS simulator with successful migration completion and
active_identity table creation with proper data migration.

src/services/platforms/CapacitorPlatformService.ts

@@ -508,9 +508,24 @@ export class CapacitorPlatformService implements PlatformService {
         // This is essential for proper parameter binding and SQL injection prevention
         await this.db!.run(sql, params);
       } else {
-        // Use execute method for non-parameterized queries
-        // This is more efficient for simple DDL statements
-        await this.db!.execute(sql);
+        // For multi-statement SQL (like migrations), use executeSet method
+        // This handles multiple statements properly
+        if (
+          sql.includes(";") &&
+          sql.split(";").filter((s) => s.trim()).length > 1
+        ) {
+          // Multi-statement SQL - use executeSet for proper handling
+          const statements = sql.split(";").filter((s) => s.trim());
+          await this.db!.executeSet(
+            statements.map((stmt) => ({
+              statement: stmt.trim(),
+              values: [], // Empty values array for non-parameterized statements
+            })),
+          );
+        } else {
+          // Single statement - use execute method
+          await this.db!.execute(sql);
+        }
       }
     };