Initial commit: KiraTV IPTV proxy server

Full-stack IPTV management system with Xtream Codes API compatibility,
multi-account provider fan-out, Jellyfin local library integration,
real-time dashboard, EPG support, and A/V-sync-safe stream recovery.

backend/models/provider.py

@@ -0,0 +1,24 @@
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, Text, func
+from sqlalchemy.orm import relationship
+from ..database import Base
+
+
+class ProviderAccount(Base):
+    __tablename__ = "provider_accounts"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String(100), nullable=False)
+    base_url = Column(String(500), nullable=False)
+    username = Column(String(200), nullable=False)
+    password = Column(String(200), nullable=False)
+    max_connections = Column(Integer, default=1, nullable=False)
+    is_active = Column(Boolean, default=True, nullable=False)
+    last_sync_at = Column(DateTime(timezone=True), nullable=True)
+    expiry_date = Column(DateTime(timezone=True), nullable=True)
+    # 0 = disabled; 6/12/24 = sync every N hours automatically
+    auto_sync_hours = Column(Integer, default=0, nullable=False)
+    # JSON: {"live": ["cat_id", ...], "movie": [...], "series": [...]}
+    last_sync_categories = Column(Text, nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    channel_maps = relationship("ChannelProviderMap", back_populates="provider_account", cascade="all, delete-orphan")