Add API endpoints for replies and thread persistence

[3m1n3nc3]

Problem

Replies are currently handled as local UI state and are not persisted through an API contract.

Current State

• No dedicated API endpoints for creating/listing replies tied to entries or contributions.
• Reply interactions do not survive refresh and cannot be indexed or moderated.

Acceptance Criteria

• Add REST handlers for reply create/list/delete with ownership checks.
• Persist and return threaded reply structures for post detail rendering.
• Update frontend integration to use API responses instead of local-only addReply state mutation.

[Diggardson270]

@Diggardson270 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

waddup 3m1n3nc3

I would like to resolve this issue. Replies need to live in the database instead of disappearing on refresh, so I'll add create, list, and delete endpoints scoped to their parent entry with ownership checks baked in. The replies table will support threading via a nullable parentReplyId field from the start, and on the frontend I'll replace the local hardcoded code mutation with real API calls so the thread is always driven by the server.

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[gabito1451]

@gabito1451 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi maintainer, can I work on this task ???

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