feat(p3): add discovery, telegram notifications, and one-click favorites

Implement WBI video search with legacy fallback, classification scoring, candidate pool, permanent seen-aid dedupe, blacklist filtering, and batched Telegram notifications. Add write client for fav deal/sort, target-folder selection, insertion position calculation, read-back verification, fav_action locking, retry on failure, ignore and blacklist actions. Wire discovery, candidate cleanup, Telegram long polling, and new discover/candidates CLI commands into the scheduler. Add migration v3 for candidate duration and index stats.

tests/test_migrations.py

@@ -37,18 +37,22 @@ def test_fresh_and_idempotent():
         conn = sqlite3.connect(Path(tmp) / "app.db")
         try:
             applied = run_migrations(conn)
-            assert applied == [1, 2]
-            assert current_version(conn) == 2
+            assert applied == [1, 2, 3]
+            assert current_version(conn) == 3
             assert EXPECTED_TABLES <= table_names(conn)
             assert "schema_version" in table_names(conn)
             columns = {
                 row[1] for row in conn.execute("PRAGMA table_info(folder_resource)")
             }
             assert "fav_time" in columns
+            candidate_columns = {
+                row[1] for row in conn.execute("PRAGMA table_info(candidate)")
+            }
+            assert {"duration", "play", "like", "favorite", "danmaku", "review"} <= candidate_columns
             # 再跑一次不应重复应用
             assert run_migrations(conn) == []
             row = conn.execute("SELECT COUNT(*) FROM schema_version").fetchone()
-            assert row[0] == 2
+            assert row[0] == 3
         finally:
             conn.close()
 
@@ -63,15 +67,15 @@ def test_backup_before_upgrade():
             conn.execute("INSERT INTO kv(k, v) VALUES ('hello', 'world')")
             conn.commit()
 
-            v3 = Migration(3, "add probe", ("CREATE TABLE probe (id INTEGER PRIMARY KEY)",))
+            v4 = Migration(4, "add probe", ("CREATE TABLE probe (id INTEGER PRIMARY KEY)",))
             applied = run_migrations(
                 conn,
                 backup_dir=backup_dir,
                 now=1_800_000_000,
-                migrations=MIGRATIONS + (v3,),
+                migrations=MIGRATIONS + (v4,),
             )
-            assert applied == [3]
-            backups = list(backup_dir.glob("app-pre-v2-*.db"))
+            assert applied == [4]
+            backups = list(backup_dir.glob("app-pre-v3-*.db"))
             assert len(backups) == 1
             check = sqlite3.connect(backups[0])
             try: