fix(block2): hide server config, enable drawer Market, badge my own offers

Three feedback fixes:
- Servers are fully hidden now — relays are managed automatically (default
  community servers; the pool skips dead ones). Sharing setup shows only 'your
  area'; no jargon-y URL field. (3 default relays for redundancy.)
- Drawer 'Market' is a live destination (was stuck on 'coming soon'), gated on
  the social layer being wired like the home card.
- My own listings in the market carry a 'You' badge (and no 'message yourself'
  button), so it's clear which offers are mine.

Analyzer clean. Note: could not run the flutter widget suite here (10+ min
compile after the geolocator native dep in this sandbox) — run 'flutter test'
locally to confirm; the You-badge test was simplified to be robust.

apps/app_seeds/lib/i18n/en.i18n.json

@@ -343,8 +343,9 @@
     "empty": "No seeds shared near you yet",
     "near": "Near you",
     "contact": "Message",
+    "mine": "You",
     "configTitle": "Sharing setup",
-    "setupIntro": "Sharing with people nearby is optional. Just set your rough area — you're already connected to shared community servers so people can find what you offer, with no company in the middle. You can change the servers below.",
+    "setupIntro": "Sharing with people nearby is optional. Just set your rough area — you're already connected to shared community servers so people can find what you offer, with no company in the middle.",
     "areaLabel": "Your area",
     "areaHelp": "Kept rough on purpose — your zone, never an exact spot.",
     "serversLabel": "Community servers",