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.

pyproject.toml

@@ -0,0 +1,23 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "bili-fav"
+version = "0.1.0"
+description = "Bilibili favorite-folder tools and Reaction video dashboard"
+readme = "README.md"
+requires-python = ">=3.14,<3.15"
+license = { text = "MIT" }
+authors = [{ name = "bili-fav contributors" }]
+dependencies = []
+
+[project.scripts]
+bili-fav = "favsort:main"
+reaction-board = "reaction_board.cli:main"
+
+[dependency-groups]
+dev = []
+
+[tool.hatch.build.targets.wheel]
+only-include = ["favsort.py", "app.py", "vendor", "reaction_board"]