Add limited time drop service layer

[a676840815-sys]

🚀 StarShop Pull Request

Mark with an x all the checkboxes that apply (like [x])

• Closes [Service] Limited Time Drop Contract Service for StarShop Frontend #282
• Added tests (if necessary)
• Run tests
• Run formatting
• Evidence attached
• Commented the code

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📌 Type of Change

• Documentation (updates to README, docs, or comments)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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📝 Changes description

• Add a LimitedTimeDropService wrapper for create/get/update/cancel/access/participation/status/time helpers.
• Add typed drop/access models, constants, validation utilities, cache/event helpers, and README usage notes.
• Document current generated-contract limitations for whitelist listing and end-time extension.

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📸 Evidence (A photo is required as evidence)

Not applicable; service-layer code change.

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⏰ Time spent breakdown

• Implementation: 1h
• Local review/diff check: 15m

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🌌 Comments

Validation: ran git diff --check locally and fetched the fork branch back to compare against the local tree. Full type/lint test not run because this environment has no npm/pnpm/yarn/tsc available.

Closes #282

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fcd1cbd4-be7b-4ff1-ba58-1812545a9dc9

📥 Commits

Reviewing files that changed from the base of the PR and between caf26b1 and 9cebdf9.

📒 Files selected for processing (7)

• src/shared/services/limited_time_drop/README.md
• src/shared/services/limited_time_drop/constants/drop.constants.ts
• src/shared/services/limited_time_drop/index.ts
• src/shared/services/limited_time_drop/limited_drop.service.ts
• src/shared/services/limited_time_drop/types/access.types.ts
• src/shared/services/limited_time_drop/types/drop.types.ts
• src/shared/services/limited_time_drop/utils/drop.utils.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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