nip71: add FEATURE_NIP71_INGEST admin toggle (default on)

Foundation for inbound NIP-71 ingest. Adds a single admin switch in the
instance config (config/instance-config.js, default true), re-exported
through config.js and surfaced as a runtime-overridable flag in
constants.js — same pattern as FEATURE_NIP71_MIRROR / ALLOW_NSFW_CONTENT.

A deployer flips one constant to disable all inbound ingest if it ever
causes problems (spam, low-quality content, performance). The ingest
adapter + service (gated on this flag) land in follow-up commits; its
behavioral test will assert the service is inert when the flag is off.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

config/instance-config.js

@@ -234,6 +234,21 @@ export const DEFAULT_WHITELIST_MODE_ENABLED = true;
  */
 export const ALLOW_NSFW_CONTENT = false;
 
+/**
+ * Whether the client ingests NIP-71 video events published by *other* Nostr
+ * apps (kinds 21/22 and addressable 34235/34236) and surfaces them in bitvid's
+ * feeds.
+ *
+ * Defaults to `true` so bitvid discovers videos from the wider Nostr ecosystem
+ * (Nostube, Flotilla, etc.). bitvid's own outbound mirrors are skipped to avoid
+ * duplicate listings, and ingested NSFW content still respects
+ * `ALLOW_NSFW_CONTENT` plus the standard trust/blacklist/mute gating.
+ *
+ * Set to `false` to disable all inbound NIP-71 ingest with a single switch if it
+ * ever causes problems (spam, low-quality content, performance).
+ */
+export const FEATURE_NIP71_INGEST = true;
+
 /**
  * Emergency fallback accounts for seeding the moderation graph.
  *

js/config.js

@@ -24,6 +24,7 @@ import {
   ADMIN_WHITELIST_MODE_STORAGE_KEY,
   DEFAULT_WHITELIST_MODE_ENABLED,
   ALLOW_NSFW_CONTENT,
+  FEATURE_NIP71_INGEST,
   DEFAULT_TRUST_SEED_NPUBS,
   DEFAULT_BLUR_THRESHOLD,
   DEFAULT_AUTOPLAY_BLOCK_THRESHOLD,
@@ -117,6 +118,7 @@ export const ADMIN_LIST_NAMESPACE = "bitvid:admin"; // Reserved for Nostr lists
 export const ADMIN_COMMUNITY_BLACKLIST_SOURCES = "community:blacklist:sources";
 export const ADMIN_COMMUNITY_BLACKLIST_PREFIX = "community:blacklist";
 export { ALLOW_NSFW_CONTENT };
+export { FEATURE_NIP71_INGEST };
 export { DEFAULT_TRUST_SEED_NPUBS };
 export { DEFAULT_BLUR_THRESHOLD };
 export { DEFAULT_AUTOPLAY_BLOCK_THRESHOLD };

js/constants.js

@@ -6,6 +6,7 @@ import {
   DEFAULT_TRUSTED_SPAM_HIDE_THRESHOLD as CONFIG_DEFAULT_TRUSTED_SPAM_HIDE_THRESHOLD,
   DEFAULT_PLAYBACK_SOURCE,
   DEFAULT_PLAYBACK_START_TIMEOUT,
+  FEATURE_NIP71_INGEST as CONFIG_FEATURE_NIP71_INGEST,
   IS_DEV_MODE,
 } from "./config.js";
 
@@ -185,6 +186,9 @@ const DEFAULT_FLAGS = Object.freeze({
   // Opt-in NIP-71 *mirror* (addressable 34235/36) managed per-video from the
   // My Videos tab. Independent of FEATURE_PUBLISH_NIP71 (legacy 21/22 auto-publish).
   FEATURE_NIP71_MIRROR: true,
+  // Inbound ingest of NIP-71 videos published by other Nostr apps. Sourced from
+  // the admin instance config so a deployer flips it in one place.
+  FEATURE_NIP71_INGEST: CONFIG_FEATURE_NIP71_INGEST !== false,
   FEATURE_HASHTAG_PREFERENCES: false,
   FEATURE_SEARCH_FILTERS: Boolean(IS_DEV_MODE),
   FEATURE_TRUST_SEEDS: true, // Rollback: disable to drop baseline trust seeds without code changes.
@@ -206,6 +210,7 @@ const runtimeFlags = (() => {
     FEATURE_WATCH_HISTORY_V2: DEFAULT_FLAGS.FEATURE_WATCH_HISTORY_V2,
     FEATURE_PUBLISH_NIP71: DEFAULT_FLAGS.FEATURE_PUBLISH_NIP71,
     FEATURE_NIP71_MIRROR: DEFAULT_FLAGS.FEATURE_NIP71_MIRROR,
+    FEATURE_NIP71_INGEST: DEFAULT_FLAGS.FEATURE_NIP71_INGEST,
     FEATURE_HASHTAG_PREFERENCES: DEFAULT_FLAGS.FEATURE_HASHTAG_PREFERENCES,
     FEATURE_SEARCH_FILTERS: DEFAULT_FLAGS.FEATURE_SEARCH_FILTERS,
     FEATURE_TRUST_SEEDS: DEFAULT_FLAGS.FEATURE_TRUST_SEEDS,
@@ -242,6 +247,11 @@ export let FEATURE_NIP71_MIRROR = coerceBoolean(
   DEFAULT_FLAGS.FEATURE_NIP71_MIRROR
 );
 
+export let FEATURE_NIP71_INGEST = coerceBoolean(
+  runtimeFlags.FEATURE_NIP71_INGEST,
+  DEFAULT_FLAGS.FEATURE_NIP71_INGEST
+);
+
 export let FEATURE_HASHTAG_PREFERENCES = coerceBoolean(
   runtimeFlags.FEATURE_HASHTAG_PREFERENCES,
   DEFAULT_FLAGS.FEATURE_HASHTAG_PREFERENCES