feat(contract): enhance get_mission with comprehensive query functions

[LaGodxy]

• Added get_missions for batch querying multiple missions
• Added mission_exists for lightweight existence checking
• Added get_mission_reward for optimized reward information fetching
• Added get_mission_status for lightweight status queries
• Enhanced documentation with detailed examples
• Added comprehensive tests for all new query functions
• All 21 tests passing successfully

These functions provide optimized read-only access for frontend UI
to verify mission details, rewards, and status efficiently."

closes #35

[Kaylahray]

Hi @LaGodxy Please Kindly Pull and fix workflow errors,

[LaGodxy]

@Kaylahray approve the workflow, it will be best to leave to be automatic approval please.

[Kaylahray]

@Kaylahray approve the workflow, it will be best to leave to be automatic approval please.

Thanks @LaGodxy I'll do that to run automatically, for now, I need you to run these commands
cargo fmt --all
cargo clippy --all-targets --all-features -- -D warnings

tag me when you're done. Thank you 🙋‍♀️

[LaGodxy]

@Kaylahray

[Kaylahray]

@LaGodxy

[LaGodxy]

@Kaylahray

I do not think you understood me, set your github action to be auto, I cant be waiting for you to always approve, its usual with pipeline to pass locally and fail here in github, when you set to auto I can work faster no need for you to always approve,

[Kaylahray]

@LaGodxy

[Kaylahray]

@Kaylahray

I do not think you understood me, set your github action to be auto, I cant be waiting for you to always approve, its usual with pipeline to pass locally and fail here in github, when you set to auto I can work faster no need for you to always approve,

I did understand, I'll fix that. Thank you 🙋‍♀️. sorry for the inconvenience.

[Kaylahray]

@LaGodxy

[LaGodxy]

@LaGodxy

@Kaylahray tick the first one, not the second.

[Kaylahray]

@LaGodxy

@Kaylahray tick the first one, not the second.

Thank you. I've done that. @LaGodxy

[LaGodxy]

@Kaylahray done.