feat(phase1): add image storage utilities

- Create backend/services/image_storage.py with 4 core functions:
  - sanitize_filename(): remove unsafe chars, limit to 255 chars, convert to lowercase
  - get_unique_filename(): handle collisions with UUID suffix (format: {name}_{uuid8}_{variant}.jpg)
  - ensure_image_directories(): create /images/ root and category subdirs on startup
  - save_image(): save bytes to /images/{category}/{filename}, returns relative path
- Create comprehensive test suite (22 tests) covering all functionality
- Integrate ensure_image_directories() into FastAPI startup event
- Directory structure: /images/{category}/{filename}
- Collision handling: auto-suffix with UUID if filename exists
- All tests passing, pathlib.Path for safe operations

venv/lib/python3.12/site-packages/uvloop/server.pxd

@@ -0,0 +1,19 @@
+cdef class Server:
+    cdef:
+        list _servers
+        list _waiters
+        int _active_count
+        Loop _loop
+        bint _serving
+        object _serving_forever_fut
+        object __weakref__
+
+    cdef _add_server(self, UVStreamServer srv)
+    cdef _start_serving(self)
+    cdef _wakeup(self)
+
+    cdef _attach(self)
+    cdef _detach(self)
+
+    cdef _ref(self)
+    cdef _unref(self)