Add moderation documentation bundle

docs/moderation/nips.md

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+# NIPs Bitvid uses (Moderation-Relevant)
+
+## Required
+- **NIP-56 — Reporting**  
+  `kind 1984` events with a `type` tag such as `nudity`, `spam`, `illegal`, `impersonation`, `malware`, `profanity`, `other`.  
+  Client may act on **reports from friends** (our trusted set).
+
+- **NIP-51 — Lists**  
+  - `10000` mute list (authors to mute).  
+  - `30000` categorized people (used for admin/curation lists).  
+  - `30001` bookmarks (not moderation, but used elsewhere).
+
+- **NIP-10 — Replies & Mentions**  
+  Threading for comments; moderation badges appear in the thread UI.
+
+## Recommended
+- **NIP-45 — COUNT**  
+  Event counts; we use it opportunistically for faster totals with graceful fallback.
+
+## Nice-to-have
+- **NIP-36 — Sensitive Content / Content Warning**  
+  If present, we pre-blur content even without reports; user can “show anyway”.