docs(security): #231 remediation plans (RLS lockdown record + storage + realtime-a)

[Jose-Gael-Cruz-Lopez]

Docs-only. Carves the three planning docs out of the #232 draft so they live in main:

• rls-lockdown-plan.md — record of the applied prod lockdown + verification checklist.
• storage-hardening-plan.md — buckets → private + signed URLs + auth uploads plan.
• realtime-jwt-bridge-design.md — option (a) design (referenced by fix(social): re-fetch realtime messages via decrypting REST + drop dead reactions sub (#124, #231) #230's code comment).

The SQL scripts stay in #232 as the applied-to-prod record (not merged). Landing this before #230 resolves #230's doc reference.

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Reviewing files that changed from the base of the PR and between d10fa01 and 9a3254d.

📒 Files selected for processing (3)

• docs/security/realtime-jwt-bridge-design.md
• docs/security/rls-lockdown-plan.md
• docs/security/storage-hardening-plan.md

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