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/pytest_cov-7.1.0.dist-info/licenses/AUTHORS.rst

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+
+Authors
+=======
+
+* Marc Schlaich - https://github.com/schlamar (\http://www.schlamar.org)
+* Rick van Hattem - http://wol.ph
+* Buck Evan - https://github.com/bukzor
+* Eric Larson - http://larsoner.com
+* Marc Abramowitz - \http://marc-abramowitz.com
+* Thomas Kluyver - https://github.com/takluyver
+* Guillaume Ayoub - http://www.yabz.fr
+* Federico Ceratto - \http://firelet.net
+* Josh Kalderimis - \http://blog.cookiestack.com
+* Ionel Cristian Mărieș - https://blog.ionelmc.ro
+* Christian Ledermann - https://github.com/cleder
+* Alec Nikolas Reiter - https://github.com/justanr
+* Patrick Lannigan - https://github.com/plannigan
+* David Szotten - https://github.com/davidszotten
+* Michael Elovskikh - https://github.com/wronglink
+* Saurabh Kumar - https://github.com/theskumar
+* Michael Elovskikh - https://github.com/wronglink
+* Daniel Hahler - https://github.com/blueyed (\https://daniel.hahler.de)
+* Florian Bruhin - http://www.the-compiler.org
+* Zoltan Kozma - https://github.com/kozmaz87
+* Francis Niu - https://flniu.github.io
+* Jannis Leidel - https://github.com/jezdez
+* Ryan Hiebert - http://ryanhiebert.com/
+* Terence Honles - https://github.com/terencehonles
+* Jeremy Bowman - https://github.com/jmbowman
+* Samuel Giffard - https://github.com/Mulugruntz
+* Семён Марьясин - https://github.com/MarSoft
+* Alexander Shadchin - https://github.com/shadchin
+* Thomas Grainger - https://graingert.co.uk
+* Juanjo Bazán - https://github.com/xuanxu
+* Andrew Murray - https://github.com/radarhere
+* Ned Batchelder - https://nedbatchelder.com/
+* Albert Tugushev - https://github.com/atugushev
+* Martín Gaitán - https://github.com/mgaitan
+* Hugo van Kemenade - https://github.com/hugovk
+* Michael Manganiello - https://github.com/adamantike
+* Anders Hovmöller - https://github.com/boxed
+* Zac Hatfield-Dodds - https://zhd.dev
+* Mateus Berardo de Souza Terra - https://github.com/MatTerra
+* Ganden Schaffner - https://github.com/gschaffner
+* Michał Górny - https://github.com/mgorny
+* Bernát Gábor - https://github.com/gaborbernat
+* Pamela McA'Nulty - https://github.com/PamelaM
+* Christian Riedel - https://github.com/Cielquan
+* Chris Sreesangkom - https://github.com/csreesan
+* Sorin Sbarnea - https://github.com/ssbarnea
+* Brian Rutledge - https://github.com/bhrutledge
+* Danilo Šegan - https://github.com/dsegan
+* Michał Bielawski - https://github.com/D3X
+* Zac Hatfield-Dodds - https://github.com/Zac-HD
+* Ben Greiner - https://github.com/bnavigator
+* Delgan - https://github.com/Delgan
+* Andre Brisco - https://github.com/abrisco
+* Colin O'Dell - https://github.com/colinodell
+* Ronny Pfannschmidt - https://github.com/RonnyPfannschmidt
+* Christian Fetzer - https://github.com/fetzerch
+* Jonathan Stewmon - https://github.com/jstewmon
+* Matthew Gamble - https://github.com/mwgamble
+* Christian Clauss - https://github.com/cclauss
+* Dawn James - https://github.com/dawngerpony
+* Tsvika Shapira - https://github.com/tsvikas
+* Marcos Boger - https://github.com/marcosboger
+* Ofek Lev - https://github.com/ofek
+* Art Pelling - https://github.com/artpelling
+* Markéta Machová - https://github.com/MeggyCal

venv/lib/python3.12/site-packages/pytest_cov-7.1.0.dist-info/licenses/LICENSE

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+The MIT License
+
+Copyright (c) 2010 Meme Dough
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.