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/handles/streamserver.pxd

@@ -0,0 +1,26 @@
+cdef class UVStreamServer(UVSocketHandle):
+    cdef:
+        int backlog
+        object ssl
+        object ssl_handshake_timeout
+        object ssl_shutdown_timeout
+        object protocol_factory
+        bint opened
+        Server _server
+
+    # All "inline" methods are final
+
+    cdef inline _init(self, Loop loop, object protocol_factory,
+                      Server server,
+                      object backlog,
+                      object ssl,
+                      object ssl_handshake_timeout,
+                      object ssl_shutdown_timeout)
+
+    cdef inline _mark_as_open(self)
+
+    cdef inline listen(self)
+    cdef inline _on_listen(self)
+
+    cdef UVStream _make_new_transport(self, object protocol, object waiter,
+                                      object context)