feat: add full-season pack option for TV best-version subscriptions

- Introduce `best_version_full` field to subscribe and subscribehistory models and migration
- Update subscription logic to support only downloading full-season packs when enabled
- Extend CLI, API, and documentation to reflect new option
- Add tests for full-season best-version behavior

database/versions/1f0d2c3b4a5e_2_2_7.py

@@ -0,0 +1,42 @@
+"""2.2.7
+为电视剧洗版增加全集整包开关
+
+Revision ID: 1f0d2c3b4a5e
+Revises: 9caa49cb3e10
+Create Date: 2026-05-13
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = "1f0d2c3b4a5e"
+down_revision = "9caa49cb3e10"
+branch_labels = None
+depends_on = None
+
+
+def _has_column(inspector: sa.Inspector, table_name: str, column_name: str) -> bool:
+    if table_name not in inspector.get_table_names():
+        return False
+    return any(column["name"] == column_name for column in inspector.get_columns(table_name))
+
+
+def upgrade() -> None:
+    inspector = sa.inspect(op.get_bind())
+    if _has_column(inspector, "subscribe", "best_version_full") is False:
+        op.add_column("subscribe", sa.Column("best_version_full", sa.Integer(), nullable=True, server_default="0"))
+
+    inspector = sa.inspect(op.get_bind())
+    if _has_column(inspector, "subscribehistory", "best_version_full") is False:
+        op.add_column("subscribehistory", sa.Column("best_version_full", sa.Integer(), nullable=True, server_default="0"))
+
+
+def downgrade() -> None:
+    inspector = sa.inspect(op.get_bind())
+    if _has_column(inspector, "subscribehistory", "best_version_full"):
+        op.drop_column("subscribehistory", "best_version_full")
+
+    inspector = sa.inspect(op.get_bind())
+    if _has_column(inspector, "subscribe", "best_version_full"):
+        op.drop_column("subscribe", "best_version_full")