feat: added Pagination standard (cursor vs offset)

[okekefrancis112]

Summary

This PR standardizes all list/collection API endpoints across both myfans-backend/ and backend/ to use consistent offset/page-based pagination, resolving #217. A shared pagination infrastructure was introduced in myfans-backend/ — PaginationQueryDto (query params: page default 1, limit default 20) and a generic PaginatedResponseDto<T> (response shape: items, total, page, limit, total_pages) — along with stateless TypeORM helpers (paginate() for QueryBuilder, createPaginatedResponse() for .findAndCount() results). Six existing modules (creators, posts, comments, messages, earnings, subscriptions) were refactored to extend the shared base DTO and return the standardized response wrapper, eliminating per-module duplication of pagination logic. A new GET /subscriptions list endpoint was added to myfans-backend/ with status filtering and creator relation loading. In backend/, the subscriptions service was updated from returning a plain array to a paginated response with a required fan query param. The earnings module was migrated from raw offset/limit to page-based pagination, with a coordinated frontend update in earnings-api.ts and TransactionHistory.tsx replacing offset state with page-based navigation and proper "Showing X-Y of Z" display. The conversations list endpoint was changed from returning an unpaginated array to a paginated response using .findAndCount() with skip/take. Each backend preserves its existing naming convention (snake_case for myfans-backend/, camelCase for backend/) to avoid breaking unrelated consumers.

Breaking Changes

• Earnings API: GET /earnings/transactions and GET /earnings/withdrawals now accept page/limit query params instead of offset/limit, and return a paginated envelope ({ items, total, page, limit, total_pages }) instead of a plain array. Frontend updated in this PR.
• Messages API: GET /conversations/:id/messages response key changed from messages to items, with added pagination metadata (total, page, limit, total_pages).
• Conversations API: GET /conversations now returns a paginated envelope instead of a plain array.

Closes: #217

[aji70]

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[aji70]

@okekefrancis112 cli is failing

[okekefrancis112]

all pass now, @aji70

[okekefrancis112]

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[aji70]

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