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/trafficscript.py

@@ -0,0 +1,51 @@
+"""
+    pygments.lexers.trafficscript
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    Lexer for RiverBed's TrafficScript (RTS) language.
+
+    :copyright: Copyright 2006-present by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer
+from pygments.token import String, Number, Name, Keyword, Operator, Text, Comment
+
+__all__ = ['RtsLexer']
+
+
+class RtsLexer(RegexLexer):
+    """
+    For Riverbed Stingray Traffic Manager
+    """
+    name = 'TrafficScript'
+    aliases = ['trafficscript', 'rts']
+    filenames = ['*.rts']
+    url = 'https://riverbed.com'
+    version_added = '2.1'
+
+    tokens = {
+        'root' : [
+            (r"'(\\\\|\\[^\\]|[^'\\])*'", String),
+            (r'"', String, 'escapable-string'),
+            (r'(0x[0-9a-fA-F]+|\d+)', Number),
+            (r'\d+\.\d+', Number.Float),
+            (r'\$[a-zA-Z](\w|_)*', Name.Variable),
+            (r'(if|else|for(each)?|in|while|do|break|sub|return|import)', Keyword),
+            (r'[a-zA-Z][\w.]*', Name.Function),
+            (r'[-+*/%=,;(){}<>^.!~|&\[\]\?\:]', Operator),
+            (r'(>=|<=|==|!=|'
+             r'&&|\|\||'
+             r'\+=|.=|-=|\*=|/=|%=|<<=|>>=|&=|\|=|\^=|'
+             r'>>|<<|'
+             r'\+\+|--|=>)', Operator),
+            (r'[ \t\r]+', Text),
+            (r'#[^\n]*', Comment),
+        ],
+        'escapable-string' : [
+            (r'\\[tsn]', String.Escape),
+            (r'[^"]', String),
+            (r'"', String, '#pop'),
+        ],
+
+    }