Close tg12 outbound audit (#348-#366): operator UA, opt-ins, docs

- User-Agent is per-install handle only (no Shadowbroker product token)
- LiveUAMap: Windows UI consent when enabling Global Incidents; env override
- Meshtastic callsign upstream header off by default (opt-in true)
- Expanded docs/OUTBOUND_DATA.md and README link for CCTV, basemap, Broadcastify

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/.env.example

@@ -31,11 +31,9 @@ AIS_API_KEY=              # https://aisstream.io/ — free tier WebSocket key
 # Requires MESH_DEBUG_MODE=true; do not enable this for ordinary use.
 # ALLOW_INSECURE_ADMIN=false
 
-# Per-install operator handle. Round 7a: every outbound third-party API
-# call (Wikipedia, Wikidata, Nominatim, GDELT, OpenMHz, Broadcastify,
-# weather.gov, NUFORC, etc.) includes this handle in the User-Agent so
-# upstreams can rate-limit / contact the specific install instead of
-# treating every Shadowbroker user as one entity.
+# Per-install operator handle. Round 7a: outbound third-party API calls send
+# this handle as the User-Agent (e.g. operator-7f3a92), not a shared app name,
+# so upstreams rate-limit one install instead of blocking every user.
 #
 # Default empty -> a stable pseudonymous handle (e.g. "operator-7f3a92") is
 # auto-generated on first run and persisted to backend/data/operator_handle.json.
@@ -43,10 +41,8 @@ AIS_API_KEY=              # https://aisstream.io/ — free tier WebSocket key
 # set it here. Special characters are sanitized to dashes.
 # OPERATOR_HANDLE=
 
-# Default outbound User-Agent for all third-party HTTP fetchers. Operators
-# who run a public relay and want a completely custom UA can set this; it
-# bypasses the per-operator helper entirely. Most installs should leave it
-# unset and use OPERATOR_HANDLE instead.
+# Full User-Agent override (replaces the operator handle entirely). Rare;
+# most installs should use OPERATOR_HANDLE only.
 # SHADOWBROKER_USER_AGENT=
 
 # Nominatim-specific User-Agent override (OSM usage policy). Leave unset to
@@ -122,12 +118,16 @@ AIS_API_KEY=              # https://aisstream.io/ — free tier WebSocket key
 # can identify per-install traffic instead of aggregated "ShadowBroker" hits.
 # Leave blank to send a generic UA. If you set MESHTASTIC_OPERATOR_CALLSIGN,
 # it is included in outbound headers to meshtastic.org by default so they
-# can rate-limit per-operator. Set MESHTASTIC_SEND_CALLSIGN_HEADER=false to
-# suppress the callsign while still using it locally (e.g. for APRS).
+# can rate-limit per-operator. Callsign is NOT sent upstream unless you opt in.
 # MESHTASTIC_OPERATOR_CALLSIGN=
-# MESHTASTIC_SEND_CALLSIGN_HEADER=true
+# MESHTASTIC_SEND_CALLSIGN_HEADER=false
 # MESH_MQTT_PSK=                       # hex-encoded, empty = default LongFast key
 
+# LiveUAMap Playwright scraper (#348). Linux/macOS: on by default when Global
+# Incidents layer is active. Windows: off until the operator enables Global
+# Incidents in the UI (consent dialog) or sets SHADOWBROKER_ENABLE_LIVEUAMAP_SCRAPER=true.
+# SHADOWBROKER_ENABLE_LIVEUAMAP_SCRAPER=false forces off on all platforms.
+
 # ── Mesh / Reticulum (RNS) ─────────────────────────────────────
 # Full-node / participant-node posture for public Infonet sync.
 # MESH_NODE_MODE=participant      # participant | relay | perimeter