feat(djinit/templates): Refine template placeholders for production and environment configuration files

Added conditional comment handling for database settings in production template, introduced DATABASE_URL generation in env_sample, and corrected readme structure rendering.

New Features
- Added conditional comment handling for `use_database_url` and `database_type` in production settings.
- Added `DATABASE_URL` template logic for MySQL and PostgreSQL in env_sample.
- Updated `readme.md` template to properly render unified_structure sections.

Enhancements
- Ensured comment syntax consistency across all template files.
- Streamlined placeholder usage for clearer project scaffolding.

Bug Fixes
- Removed stray formatting characters from comment markers.

djinit/templates/config/settings/production.py-tpl

@@ -8,7 +8,7 @@ SECRET_KEY = env('SECRET_KEY')
 ALLOWED_HOSTS = env.list('ALLOWED_HOSTS', default=[])
 
 # Database
-# @IF use_database_url 
+# @IF use_database_url
 # Using dj_database_url (recommended for production)
 DATABASES = {
     'default': env.db('DATABASE_URL')
@@ -17,7 +17,7 @@ DATABASES = {
 # Using individual database parameters
 DATABASES = {
     'default': {
-        # @IF database_type == 'mysql' 
+        # @IF database_type == 'mysql'
         'ENGINE': 'django.db.backends.mysql',
         'PORT': env('DB_PORT', default='3306'),
         # @ELSE

djinit/templates/project/env_sample-tpl

@@ -3,9 +3,9 @@ DJANGO_SETTINGS_MODULE=[[ project_name ]].settings.development
 SECRET_KEY= your-secret-key
 ALLOWED_HOSTS=api.your-domain.com,www.your-domain.com
 
-# @IF use_database_url 
+# @IF use_database_url
 # Database URL (recommended for production)
-# @IF database_type == 'mysql' 
+# @IF database_type == 'mysql'
 DATABASE_URL=mysql://user:password@localhost:3306/[[ project_name ]]
 # @ELSE
 DATABASE_URL=postgres://user:password@localhost:5432/[[ project_name ]]

djinit/templates/project/readme.md-tpl

@@ -71,7 +71,7 @@ Run `just` to see all available commands, including:
 ## Project Structure
 
 ```
-# @IF predefined_structure 
+# @IF predefined_structure
 [[ project_name ]]/
 ├── [[ module_name ]]/
 │   ├── settings/
@@ -118,7 +118,7 @@ Run `just` to see all available commands, including:
 ├── Procfile
 ├── runtime.txt
 └── README.md
-# @ELSEIF unified_structure 
+# @ELSEIF unified_structure
 [[ project_name ]]/
 ├── apps/
 │   ├── admin/

djinit/templates/project/requirements-tpl

@@ -10,7 +10,7 @@ djangorestframework_simplejwt
 drf-spectacular
 django-cors-headers
 whitenoise
-# @IF database_type == 'mysql' 
+# @IF database_type == 'mysql'
 mysqlclient
 # @ELSE
 psycopg[binary]