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/pygments/lexers/gleam.py

@@ -0,0 +1,74 @@
+"""
+    pygments.lexers.gleam
+    ~~~~~~~~~~~~~~~~~~~~~
+
+    Lexer for the Gleam programming language.
+
+    :copyright: Copyright 2006-present by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, words, bygroups
+from pygments.token import Comment, Operator, Keyword, Name, String, \
+    Number, Punctuation, Whitespace
+
+__all__ = ['GleamLexer']
+
+
+class GleamLexer(RegexLexer):
+    """
+    Lexer for the Gleam programming language (version 1.0.0).
+    """
+
+    name = 'Gleam'
+    url = 'https://gleam.run/'
+    filenames = ['*.gleam']
+    aliases = ['gleam']
+    mimetypes = ['text/x-gleam']
+    version_added = '2.19'
+
+    keywords = words((
+        'as', 'assert', 'auto', 'case', 'const', 'delegate', 'derive', 'echo',
+        'else', 'fn', 'if', 'implement', 'import', 'let', 'macro', 'opaque',
+        'panic', 'pub', 'test', 'todo', 'type', 'use',
+    ), suffix=r'\b')
+
+    tokens = {
+        'root': [
+            # Comments
+            (r'(///.*?)(\n)', bygroups(String.Doc, Whitespace)),
+            (r'(//.*?)(\n)', bygroups(Comment.Single, Whitespace)),
+
+            # Keywords
+            (keywords, Keyword),
+            (r'([a-zA-Z_]+)(\.)', bygroups(Keyword, Punctuation)),
+
+            # Punctuation
+            (r'[()\[\]{}:;,@]+', Punctuation),
+            (r'(#|!=|!|==|\|>|\|\||\||\->|<\-|&&|<<|>>|\.\.|\.|=)', Punctuation),
+
+            # Operators
+            (r'(<>|\+\.?|\-\.?|\*\.?|/\.?|%\.?|<=\.?|>=\.?|<\.?|>\.?|=)', Operator),
+
+            # Strings
+            (r'"(\\"|[^"])*"', String),
+
+            # Identifiers
+            (r'\b(let)(\s+)(\w+)', bygroups(Keyword, Whitespace, Name.Variable)),
+            (r'\b(fn)(\s+)(\w+)', bygroups(Keyword, Whitespace, Name.Function)),
+            (r'[a-zA-Z_/]\w*', Name),
+
+            # numbers
+            (r'(\d+(_\d+)*\.(?!\.)(\d+(_\d+)*)?|\.\d+(_\d+)*)([eEf][+-]?[0-9]+)?', Number.Float),
+            (r'\d+(_\d+)*[eEf][+-]?[0-9]+', Number.Float),
+            (r'0[xX][a-fA-F0-9]+(_[a-fA-F0-9]+)*(\.([a-fA-F0-9]+(_[a-fA-F0-9]+)*)?)?p[+-]?\d+', Number.Float),
+            (r'0[bB][01]+(_[01]+)*', Number.Bin),
+            (r'0[oO][0-7]+(_[0-7]+)*', Number.Oct),
+            (r'0[xX][a-fA-F0-9]+(_[a-fA-F0-9]+)*', Number.Hex),
+            (r'\d+(_\d+)*', Number.Integer),
+
+            # Whitespace
+            (r'\s+', Whitespace),
+
+        ],
+    }