Refactor pyfragment structure: Move models to domain-specific modules

- Moved PaymentMethod and other enums from models to enums.py for better organization.
- Refactored imports in various files to reflect the new structure.
- Created new model files for ads, anonymous numbers, giveaways, marketplace, purchases, and tonapi.
- Removed the old models.py file to clean up the codebase.
- Updated all relevant imports in the codebase to use the new model locations.

examples/purchase/run_premium_giveaway.py

@@ -9,7 +9,7 @@ Channel can be "@channel", "channel", or "https://t.me/channel".
 import asyncio
 
 from pyfragment import ConfigurationError, FragmentClient, UserNotFoundError
-from pyfragment.models.enums import PaymentMethod
+from pyfragment.enums import PaymentMethod
 
 SEED = "word1 word2 ... word24"
 API_KEY = "YOUR_TONAPI_KEY"

examples/purchase/run_stars_giveaway.py

@@ -9,7 +9,7 @@ Channel can be "@channel", "channel", or "https://t.me/channel".
 import asyncio
 
 from pyfragment import ConfigurationError, FragmentClient, UserNotFoundError
-from pyfragment.models.enums import PaymentMethod
+from pyfragment.enums import PaymentMethod
 
 SEED = "word1 word2 ... word24"
 API_KEY = "YOUR_TONAPI_KEY"

examples/purchase/send_premium.py

@@ -9,7 +9,7 @@ Username can be "@username", "username", or "https://t.me/username".
 import asyncio
 
 from pyfragment import ConfigurationError, FragmentClient, UserNotFoundError
-from pyfragment.models.enums import PaymentMethod
+from pyfragment.enums import PaymentMethod
 
 SEED = "word1 word2 ... word24"
 API_KEY = "YOUR_TONAPI_KEY"

examples/purchase/send_stars.py

@@ -9,7 +9,7 @@ Username can be "@username", "username", or "https://t.me/username".
 import asyncio
 
 from pyfragment import ConfigurationError, FragmentClient, UserNotFoundError
-from pyfragment.models.enums import PaymentMethod
+from pyfragment.enums import PaymentMethod
 
 SEED = "word1 word2 ... word24"
 API_KEY = "YOUR_TONAPI_KEY"