feat: implement password generation method; enhance database creation with secure password generation

src/databaseManager/database/database.manager.service.ts

@@ -103,6 +103,27 @@ export class DatabaseManagerService extends DatabaseEncryptionService {
 
     return connectionOptions;
   }
+  generatePassword(length: number = 16): string {
+    const upperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    const lowerCase = "abcdefghijklmnopqrstuvwxyz";
+    const numbers = "0123456789";
+    const symbols = "!@#$%^&*()_+[]{}|;:,.<>?";
+    
+    // Ensure at least one character from each required category
+    let password = "";
+    password += upperCase.charAt(Math.floor(Math.random() * upperCase.length));
+    password += numbers.charAt(Math.floor(Math.random() * numbers.length));
+    password += symbols.charAt(Math.floor(Math.random() * symbols.length));
+    
+    // Fill the rest with random characters from all categories
+    const allChars = upperCase + lowerCase + numbers + symbols;
+    for (let i = 3; i < length; i++) {
+      password += allChars.charAt(Math.floor(Math.random() * allChars.length));
+    }
+    
+    // Shuffle the password to randomize the position of required characters
+    return password.split('').sort(() => Math.random() - 0.5).join('');
+  }
 
   async createDatabase(projectId: string): Promise<Database> {
     const node = await this.databaseNodeService.findOptimalNode();
@@ -121,7 +142,7 @@ export class DatabaseManagerService extends DatabaseEncryptionService {
     const q_username = `q_user_${Math.random().toString(36).substring(2, 8)}`;
     const databaseName = `db_${Math.random().toString(36).substring(2, 8)}`;
     const password = this.encryptPassword(
-      Math.random().toString(36).substring(2, 10)
+      this.generatePassword()
     );
 
     await this.databaseNodeService.initDatabase(