Improve gym challenge command with location-aware and case-insensitive search

- Updated gym challenge to automatically search in player's current location first
- Made gym search case-insensitive (forest guardian, Forest Guardian, FOREST GUARDIAN all work)
- Added helpful error messages showing available gyms in current location
- Updated gym info command to also prioritize current location and be case-insensitive
- Added get_gym_by_name_in_location() database method for location-specific searches
- Improved user experience by removing need to travel between locations to challenge gyms

Fixes: \!gym challenge forest guardian now works correctly

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/database.py

@@ -770,18 +770,31 @@ class Database:
             return [dict(row) for row in rows]
     
     async def get_gym_by_name(self, gym_name: str) -> Optional[Dict]:
-        """Get gym details by name"""
+        """Get gym details by name (case-insensitive)"""
         async with aiosqlite.connect(self.db_path) as db:
             db.row_factory = aiosqlite.Row
             cursor = await db.execute("""
                 SELECT g.*, l.name as location_name
                 FROM gyms g
                 JOIN locations l ON g.location_id = l.id
-                WHERE g.name = ?
+                WHERE LOWER(g.name) = LOWER(?)
             """, (gym_name,))
             row = await cursor.fetchone()
             return dict(row) if row else None
     
+    async def get_gym_by_name_in_location(self, gym_name: str, location_id: int) -> Optional[Dict]:
+        """Get gym details by name in a specific location (case-insensitive)"""
+        async with aiosqlite.connect(self.db_path) as db:
+            db.row_factory = aiosqlite.Row
+            cursor = await db.execute("""
+                SELECT g.*, l.name as location_name
+                FROM gyms g
+                JOIN locations l ON g.location_id = l.id
+                WHERE g.location_id = ? AND LOWER(g.name) = LOWER(?)
+            """, (location_id, gym_name))
+            row = await cursor.fetchone()
+            return dict(row) if row else None
+    
     async def get_gym_team(self, gym_id: int, difficulty_multiplier: float = 1.0) -> List[Dict]:
         """Get gym team with difficulty scaling applied"""
         async with aiosqlite.connect(self.db_path) as db: