docs: update documentation for global settings and email integration with improved formatting

Author: JasonKrik

services/backend/GLOBAL_SETTINGS.md

@@ -954,25 +954,29 @@ The `getBoolean()` method accepts these string values:
 ### Usage Patterns
 
 #### Simple Value Retrieval
+
 ```typescript
 const value = await GlobalSettings.get('key.name');
 const valueWithDefault = await GlobalSettings.get('key.name', 'default');
 ```
 
 #### Type-Safe Retrieval
+
 ```typescript
 const isEnabled = await GlobalSettings.getBoolean('feature.enabled', false);
 const maxSize = await GlobalSettings.getNumber('upload.max_size', 10);
 const apiUrl = await GlobalSettings.getUrl('api.endpoint');
 ```
 
 #### Batch Retrieval
+
 ```typescript
 const settings = await GlobalSettings.getMultiple(['key1', 'key2', 'key3']);
 const groupSettings = await GlobalSettings.getGroupValues('smtp');
 ```
 
 #### Validation and Checks
+
 ```typescript
 if (await GlobalSettings.isSet('api.key')) {
   const apiKey = await GlobalSettings.getRequired('api.key');

services/backend/Mail.md

@@ -14,7 +14,7 @@ The email system provides a comprehensive solution for sending templated emails
 
 ## Architecture
 
-```
+```text
 src/email/
 ├── emailService.ts       # Main email service with SMTP integration
 ├── templateRenderer.ts   # Pug template compilation and rendering
@@ -540,27 +540,35 @@ export class DeploymentService {
 ### Common Issues
 
 1. **SMTP Configuration Not Found**
-   ```
+
+   ```text
    Error: SMTP configuration is not complete. Please configure SMTP settings in global settings.
    ```
+
    **Solution**: Configure SMTP settings in the global settings interface.
 
 2. **Template Not Found**
-   ```
+
+   ```text
    Error: Template 'welcome' not found at /path/to/templates/welcome.pug
    ```
+
    **Solution**: Ensure the template file exists in the templates directory.
 
 3. **Invalid Email Address**
-   ```
+
+   ```text
    Error: Invalid email address
    ```
+
    **Solution**: Validate email addresses before sending.
 
 4. **SMTP Connection Failed**
-   ```
+
+   ```text
    Error: Connection timeout
    ```
+
    **Solution**: Check SMTP server settings and network connectivity.
 
 ### Debug Mode

services/backend/test.md

@@ -31,7 +31,7 @@ npm install
 - Test files must follow the naming convention: `<TEST_NAME>.e2e.test.ts`.
 - Tests run sequentially in alphabetical order to ensure proper dependencies.
 
-### Current Test Files (in execution order):
+### Current Test Files (in execution order)
 
 1. **`setup.e2e.test.ts`** - Database setup and initialization
 2. **`user-registration.e2e.test.ts`** - User registration and role assignment