Issue #3607991: Add a codebase metrics documentation page

Frank Mablyrequested to merge
issue/domain-3607991:3607991-codebase-metrics-3x into 3.x

Adds a Codebase metrics documentation page to the mkdocs site: a measured snapshot of the codebase and all of its modules, counted with cloc.

  • Lines by language, a production vs test split, code/comment/blank composition, a per-module ranking, a Test suite section (classes and methods by type), and an Architecture surface section (services, plugins, hooks, routes, entities, config schema). Static inline SVG charts, no JavaScript.
  • Enables the tables Markdown extension (needed to render the metric tables), adds a nav entry in all three locales (en/fr/es), and adds cloc to the cspell word list. Verified with mkdocs build --strict.

The fr/es nav labels are translated ("Métriques du code" / "Métricas del código"); the page content is English (falls back for other locales), consistent with English being the reference language.

Snapshot (3.x): 34,898 lines of code across 485 files; production 22,459 / test 12,439; 118 test classes / 290 methods; 9 modules.

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