fix(report): allow community_watch_* reasons in DB check constraint

[mashbean]

Problem

The GraphQL ReportReason enum (src/types/system.ts) declares community_watch_porn_ad and community_watch_spam_ad, but the report.reason DB check constraint (report_reason_check, from 20231221154057_alter_report_add_reason) only allows the original five values. submitReport inserts the raw reason, so any report submitted with either community_watch value fails in production:

new row for relation "report" violates check constraint "report_reason_check"
(INTERNAL_SERVER_ERROR)

Surfaced live by the coastguard bot's Tier-1 reports (it sent community_watch_porn_ad and every insert was rejected).

Fix

Migration realigns the DB check constraint with the schema — adds the two community_watch values. The enum is the contract; the constraint had drifted.

communityWatchRemoveComment is unaffected: it syncs illegal_advertising (not these values) into the report table.

Notes / follow-up

• The OSS reports view (src/queries/system/oss/reports.ts) filters reason = 'illegal_advertising'; community_watch_* reports won't appear there. If those should surface in that view, that's a separate product decision.
• Alternative considered: map community_watch_* → illegal_advertising in the submitReport resolver, or drop them from the submittable enum. Chose the migration since the enum already advertises them as valid ReportReason values with doc comments — the DB was simply stale.

Test plan

• Run migration on staging; submitReport with community_watch_porn_ad/community_watch_spam_ad succeeds
• communityWatchRemoveComment still works (illegal_advertising)
• down migration restores the original five-value constraint

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.03%. Comparing base (85bdbe1) to head (fd62323).
⚠️ Report is 33 commits behind head on develop.

Files with missing lines	Patch %	Lines
...3000000_alter_report_reason_add_community_watch.js	80.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4844      +/-   ##
===========================================
+ Coverage    72.82%   73.03%   +0.21%     
===========================================
  Files         1054     1066      +12     
  Lines        21263    21638     +375     
  Branches      4671     4808     +137     
===========================================
+ Hits         15485    15804     +319     
+ Misses        5706     5354     -352     
- Partials        72      480     +408     

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