Phase 4: HTMX frontend with dark palette

- 4 pages: Pantry, Recipes, Shopping List, Cook Log
- HTMX-powered: add/delete pantry items, toggle shopping, generate smart list
- Custom 13-colour palette from Lospec (dark bg, yellow accent)
- Mobile-responsive
- Whitenoise for static files in production
- All routes under /app/
- API (/api/) stays internal, frontend (/app/) for browser use

requirements.txt

@@ -5,6 +5,7 @@ charset-normalizer==3.4.7
 Django==5.2.12
 djangorestframework==3.17.1
 extruct==0.18.0
+gunicorn==25.3.0
 html-text==0.7.1
 html5lib==1.1
 idna==3.11
@@ -13,6 +14,7 @@ jstyleson==0.0.2
 lxml==6.0.2
 lxml_html_clean==0.4.4
 mf2py==2.0.1
+packaging==26.0
 pyparsing==3.3.2
 pyrdfa3==3.6.5
 rdflib==7.6.0
@@ -25,3 +27,4 @@ typing_extensions==4.15.0
 urllib3==2.6.3
 w3lib==2.4.1
 webencodings==0.5.1
+whitenoise==6.12.0