feat: add curl-friendly endpoints for text and file pastes, enhance A…

[kek-Sec]

This pull request introduces new, curl-friendly endpoints for creating text and file pastes, enhances raw-body support for paste creation, and improves API documentation and file storage robustness. It also updates tests and documentation to reflect these changes, while maintaining backward compatibility with the original /send endpoint.

API Enhancements:

• Added dedicated endpoints: POST /send/text for text pastes and POST /send/file for file pastes, both designed to be curl-friendly and to support raw request bodies. [1] [2] [3] [4]
• The new endpoints accept text or file data directly in the request body, simplifying CLI and automation workflows. [1] [2] [3]

Documentation Updates:

• Expanded the API section in Readme.md with practical curl examples for both text and file flows, and clarified accepted options and response formats.
• Updated CHANGELOG.md to summarize the new features and improvements.

File Storage Robustness:

• Hardened file storage logic to safely fall back to a temp directory if STORAGE_PATH is unset, ensuring reliable file handling in all environments.

Testing Improvements:

• Added tests for the new endpoints and raw-body flows, and updated route and rate limiter tests to cover the expanded API. [1] [2] [3] [4]

Version Bump:

• Updated application version to 1.0.10 to reflect these new features.…PI documentation, and improve file handling