Add missing get_episode_date method and bump version to v0.6.0

🐛 Database Fix:
• Add missing get_episode_date() method to NFOGuardDatabase
• Fixes: 'NFOGuardDatabase' object has no attribute 'get_episode_date'

🔄 Version Update:
• Bump VERSION from 0.2.22 to 0.6.0
• Major feature release with comprehensive TV enhancements

✅ Now Works:
• Single season processing via /tv/scan-season
• Single episode processing via /tv/scan-episode
• Enhanced NFO generation with Sonarr API metadata
• Database queries for existing episode dates

VERSION

@@ -1 +1 @@
-0.2.22
+0.6.0

core/database.py

@@ -141,6 +141,23 @@ class NFOGuardDatabase:
                 for row in rows
             ]
 
+    def get_episode_date(self, imdb_id: str, season: int, episode: int) -> Optional[Dict[str, Any]]:
+        """Get episode date information for a specific episode"""
+        with self.get_connection() as conn:
+            row = conn.execute(
+                "SELECT aired, dateadded, source, has_video_file FROM episode_dates WHERE imdb_id = ? AND season = ? AND episode = ?",
+                (imdb_id, season, episode)
+            ).fetchone()
+            
+            if row:
+                return {
+                    "aired": row[0],
+                    "dateadded": row[1],
+                    "source": row[2],
+                    "has_video_file": bool(row[3])
+                }
+            return None
+
     def upsert_episode_date(
         self, 
         imdb_id: str,