fix(core): resolve permission denied errors and anonymization issues

[CuriousLearner]

Core Fixes

• Fix permission denied errors for
  django_postgres_anon tables
• Add anon_fix_permissions management
  command
• Fix search path for masked roles to see
  anonymized views
• Move role record update before switching
  to prevent errors

UI Improvements

• Add syntax highlighting to all code
  blocks
• Add copy-to-clipboard buttons with
  visual feedback
• Clean up template code display across
  all pages
• Fix Normal Data Access section showing
  incorrect data

Example App Enhancements

• Replace fake demo data with realistic
  names
• Change anonymization demo from
  superuser-only to all logged-in users
• Add demo application documentation to
  README
• Fix middleware interference with Django
  admin

Code Quality

• Fix all linting issues (ruff)
• Add S311 exemption for demo data
  generation
• Fix import sorting and unused variables
• Add staticfiles/ to .gitignore

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 86.04651% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.10%. Comparing base (8bfaf95) to head (02af9a8).
⚠️ Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
django_postgres_anon/utils.py	75.60%	10 Missing ⚠️
django_postgres_anon/context_managers.py	81.81%	2 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #2      +/-   ##
==========================================
- Coverage   88.16%   88.10%   -0.06%     
==========================================
  Files          19       20       +1     
  Lines        1555     1623      +68     
==========================================
+ Hits         1371     1430      +59     
- Misses        184      193       +9     

Flag	Coverage Δ
unittests	88.10% <86.04%> (-0.06%)	⬇️

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