fix: enforce content moderation on doubt and reply edits (#474)

[vedant7007]

User description

Closes #474

doubt and reply creation ran moderateContent() + handleModerationViolation() before persisting, but the edit paths skipped moderation entirely. users could post clean content then edit in abusive material bypassing the 3-strike system.

what i fixed:

• doubts/action/[id]/route.ts: added moderateContent check in the edit action before db.update(), matching the POST handler pattern
• replies/action/[id]/route.ts: same moderation check in PATCH handler before building updateData

edge cases: subject-only or imageUrl-only edits skip moderation (no text to check). null/empty content skips moderation but edit still proceeds. strikes increment correctly through existing handleModerationViolation flow.

for labels i think gssoc:approved + level:advanced + type:security + quality:clean fits here. happy to make changes if needed!

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CodeAnt-AI Description

Block moderated content from being saved in doubt and reply edits

What Changed

• Editing a doubt or reply now checks the new text before saving it
• If the edited text violates moderation rules, the edit is rejected with an error instead of being applied
• Empty text and non-text-only edits still proceed without a moderation check

Impact

✅ Fewer abusive edits slipping through
✅ Stronger moderation on post updates
✅ Safer community replies and doubts

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Reviewing files that changed from the base of the PR and between 99d5b8b and b1045a3.

📒 Files selected for processing (2)

• src/app/api/doubts/action/[id]/route.ts
• src/app/api/replies/action/[id]/route.ts

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