Enforce Dupes Clause and Shiny Clause rules

Dupes Clause greys out Pokemon in the encounter modal whose evolution
family has already been caught, preventing duplicate selections. Shiny
Clause adds a dedicated Shiny Box and lets shiny catches bypass the
one-per-route lock via a new is_shiny column on encounters and a
/pokemon/families endpoint that computes evolution family groups.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/app/api/encounters.py

@@ -50,8 +50,12 @@ async def create_encounter(
             detail="Cannot create encounter on a parent route. Use a child route instead.",
         )
 
+    # Shiny clause: shiny encounters bypass the route-lock check
+    shiny_clause_on = run.rules.get("shinyClause", True) if run.rules else True
+    skip_route_lock = data.is_shiny and shiny_clause_on
+
     # If this route has a parent, check if sibling already has an encounter
-    if route.parent_route_id is not None:
+    if route.parent_route_id is not None and not skip_route_lock:
         # Get all sibling routes (routes with same parent, including this one)
         siblings_result = await session.execute(
             select(Route).where(Route.parent_route_id == route.parent_route_id)
@@ -99,6 +103,7 @@ async def create_encounter(
         nickname=data.nickname,
         status=data.status,
         catch_level=data.catch_level,
+        is_shiny=data.is_shiny,
     )
     session.add(encounter)
     await session.commit()