Add WebDAV backup, statistics, progress and dashboard

- WebDAV uploader: concurrency, request and bandwidth limits, retry with
  backoff, offline catch-up, encrypted manifests, durability tracking
- Automatic unique remote directory claimed with a conditional PUT
- AES-256-GCM client-side encryption with keyed blob names
- /stats, /progress, /progress/stream and a /dashboard page
- Own ctypes inotify binding with a compact watch tree (263 MB -> 76 MB RSS)
- Directory-path ignore patterns and a forget command
- Indexed range queries instead of LIKE for path prefixes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

pyproject.toml

@@ -11,11 +11,12 @@ requires-python = ">=3.12"
 dependencies = [
     "fastapi>=0.110",
     "uvicorn>=0.29",
-    "asyncinotify>=4.0",
+    "httpx>=0.27",
+    "cryptography>=42",
 ]
 
 [project.optional-dependencies]
-dev = ["pytest>=8", "httpx>=0.27"]
+dev = ["pytest>=8"]
 
 [project.scripts]
 versiond = "versiond.cli:main"
@@ -23,5 +24,8 @@ versiond = "versiond.cli:main"
 [tool.setuptools.packages.find]
 where = ["src"]
 
+[tool.setuptools.package-data]
+versiond = ["dashboard.html"]
+
 [tool.pytest.ini_options]
 testpaths = ["tests"]