fix: align all 212 tests with current API and add CI workflows

Update integration tests to match actual endpoint responses: remove
data wrappers, use snake_case fields, correct HTTP methods (PUT→POST
for directory create), status codes (200→204 for mutations), and
request formats (params→json for 2FA). Fix root-level and unit tests
for DatabaseManager migration, model CRUD patterns, and JWT setup.
Add GitHub Actions and Gitea CI configs with ubuntu-latest + Python 3.13.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -16,6 +16,7 @@ dependencies = [
     "httpx>=0.27.0",
     "itsdangerous>=2.2.0",
     "loguru>=0.7.3",
+    "orjson>=3.11.7",
     "pyjwt>=2.10.1",
     "pyotp>=2.9.0",
     "pytest>=9.0.2",