Sprint 14: Map-Fixes, City-Prewarm, Dog-Animation, Scan-Flash

Karte:
- Frankfurt-Fallback (Zoom 10→14 flyTo) mit _frankfurtTimer-Cancel
  wenn echter Standort eintrifft
- OSM-Tile-Fetch parallelisiert (asyncio.Semaphore(3))
- Bounds-Fix: invalidateSize() + pad(0.15) vor getBounds()
- map-pin-slash Icon für gesperrten Standort
- Scan-Done-Flash: Statusbar-Pill grün bei 100%
- Schnüffelhund: outer div (by-wander X) + inner SVG (by-sniff Y)
  für natürlichere zweiachsige Bewegung

Backend:
- City-Prewarm-Job: ~70 deutsche Großstädte beim Start (+90s) und
  wöchentlich (So 01:00), Fortschritts-Mails alle 5h an ADMIN_EMAIL
- ADMIN_EMAIL Env-Var in .env.example dokumentiert

Bugfixes:
- Profil-Edit: /api/profile → /profile (doppelter Prefix)
- Friends: Mobile-Portrait-Layout (flex-wrap, overflow-x:hidden)
- Trainingspläne: Pills text-wrap (flex + white-space:normal)

backend/routes/osm.py

@@ -4,6 +4,7 @@ Cacht OSM-Daten lokal, erlaubt Nutzern eigene Marker und Meldungen.
 """
 
 import math
+import asyncio
 import httpx
 import logging
 from typing   import Optional
@@ -142,8 +143,11 @@ async def get_pois(
         stale = _stale_tiles(type, tiles)
 
         if stale and not fast:
-            for (x, y) in stale:
-                await _fetch_and_store_tile(type, x, y)
+            sem = asyncio.Semaphore(3)
+            async def _limited(x, y):
+                async with sem:
+                    await _fetch_and_store_tile(type, x, y)
+            await asyncio.gather(*[_limited(x, y) for (x, y) in stale])
             fetched_fresh = True
 
         with db() as conn:
@@ -309,9 +313,16 @@ async def analyze_region(
     tiles = _covering_tiles(south, west, north, east, CACHE_ZOOM)
 
     async def _warmup():
-        for poi_type in OSM_QUERIES:
-            for (x, y) in _stale_tiles(poi_type, tiles):
+        sem = asyncio.Semaphore(3)
+        async def _limited(poi_type, x, y):
+            async with sem:
                 await _fetch_and_store_tile(poi_type, x, y)
+        tasks = [
+            _limited(pt, x, y)
+            for pt in OSM_QUERIES
+            for (x, y) in _stale_tiles(pt, tiles)
+        ]
+        await asyncio.gather(*tasks)
 
     background_tasks.add_task(_warmup)
     return {'status': 'gestartet', 'tiles': len(tiles), 'types': list(OSM_QUERIES.keys())}