feat(p0): add favorite folder sync and sqlite data foundation

Implement P0 of the reaction dashboard: config loading with hot reload, SQLite migrations with backups, single-writer queue, read-only Bilibili fav client, folder import/diff sync, invalid-resource handling, blacklist seed, scheduler, and JSON redacted logging. Includes offline unit and transport-level contract tests; all existing and new tests pass.

uv.lock

@@ -0,0 +1,13 @@
+version = 1
+revision = 3
+requires-python = "==3.14.*"
+
+[[package]]
+name = "bili-fav"
+version = "0.1.0"
+source = { editable = "." }
+
+[package.metadata]
+
+[package.metadata.requires-dev]
+dev = []