chore(events): finish sortir → bouge sweep in .env.example

Three sortir-era references missed in the prior cleanup commits, plus
one stale "activities" doc-comment:

- Line 6 (VITE_APP_NAME comment): cfaun ships the events app as "Sortir"
  → "Bouge". Native-French feedback retired the Sortir branding.
- Line 23 (VITE_LNBITS_NOSTR_TRANSPORT_PUBKEY comment): "activities
  ticket scanner" → "events ticket scanner".
- Line 44 (section header): "Activities / Sortir Configuration" →
  "Events App Configuration".
- Line 93 (VITE_HUB_EVENTS_URL example): https://sortir.example.com
  → https://events.example.com (the comment is the subdomain-mode
  example; using the generic app name is cleaner than baking in any
  specific deployment's brand).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.env.example

@@ -3,7 +3,7 @@
 # name/short_name, and the brand string in console logs. Each standalone
 # (events, wallet, chat, market, …) gets its own VITE_APP_NAME at build
 # time via NixOS `services.webapp-standalones.<app>.displayName` (see
-# server-deploy). cfaun ships the events app as "Sortir"; defaults to
+# server-deploy). cfaun ships the events app as "Bouge"; defaults to
 # "Events" / "Wallet" / etc. when unset.
 VITE_APP_NAME=MyApp
 
@@ -20,7 +20,7 @@ VITE_WEBSOCKET_ENABLED=true
 # LNbits Nostr-transport server pubkey (kind-21000 RPC endpoint).
 # Logged by the LNbits server at startup:
 #   `Nostr transport: starting with pubkey <hex>... on N relay(s)`
-# Required for the activities ticket scanner; legacy HTTP path still
+# Required for the events ticket scanner; legacy HTTP path still
 # works without it.
 VITE_LNBITS_NOSTR_TRANSPORT_PUBKEY=
 
@@ -41,8 +41,8 @@ VITE_PUSH_NOTIFICATIONS_ENABLED=true
 # Image Upload Configuration (pict-rs)
 VITE_PICTRS_BASE_URL=https://img.mydomain.com
 
-# Activities / Sortir Configuration
-# Default language for the standalone activities app (fr, en, es)
+# Events App Configuration
+# Default language for the standalone events app (fr, en, es)
 VITE_DEFAULT_LOCALE=fr
 # Default map center as "lat,lng" (defaults to France center if not set)
 VITE_DEFAULT_MAP_CENTER=42.9667,1.6000
@@ -90,7 +90,7 @@ VITE_MARKET_NADDR=naddr1qqjxgdp4vv6rydej943n2dny956rwwf4943xzwfc95ekyd3evenrsvrr
 #   VITE_HUB_RESTAURANT_URL=https://demo.example.com/restaurant/
 #
 # In SUBDOMAIN-MODE production:
-#   VITE_HUB_EVENTS_URL=https://sortir.example.com
+#   VITE_HUB_EVENTS_URL=https://events.example.com
 #   VITE_HUB_LIBRA_URL=https://libra.example.com
 #   ...etc
 # ───────────────────────────────────────────────────────────────────────