fix(eslint): ignore python venv + playwright artifacts

The root 'Build, Test & Typecheck' CI job was failing at lint with:

  services/extraction-service/python/.venv/lib/python3.13/site-packages/
    urllib3/contrib/emscripten/emscripten_fetch_worker.js
     10:21  error  'TextEncoder' is not defined  no-undef
     12:1   error  'self' is not defined         no-undef
     40:9   error  'console' is not defined      no-undef
     70:30  error  'fetch' is not defined        no-undef
     ...

urllib3 ships emscripten worker stubs that ESLint should never see.
The Python venv was added recently and the root eslint.config.js
didn't yet have any '**/.venv/**' / '**/__pycache__/**' ignore
patterns, so 'pnpm -r exec eslint . --ext .ts,.tsx' picked them up
when run from the extraction-service workspace.

Added four ignore patterns to the root config:
  '**/.venv/**'
  '**/venv/**'
  '**/__pycache__/**'
  '**/playwright-report/**'
  '**/test-results/**'

The Python venv globs are the actual fix; the playwright ones are
preventative — per-package configs already cover most cases but
the root config is what 'pnpm -r exec eslint' walks.

eslint.config.js

@@ -12,6 +12,17 @@ export default [
       '*.config.ts',
       '**/dist/**',
       '__LOCAL_LLMs/**',
+      // Python virtual env in extraction-service/python ships with
+      // urllib3's emscripten worker stubs (JS files that reference
+      // browser globals like `self`, `fetch`, `TextEncoder`). Those
+      // files are NOT project source and must never be linted.
+      '**/.venv/**',
+      '**/venv/**',
+      '**/__pycache__/**',
+      // Playwright artifacts (per-package configs already exclude
+      // these, but the root config is what runs in CI).
+      '**/playwright-report/**',
+      '**/test-results/**',
     ],
   },
   js.configs.recommended,