docs: second-pass audit of docs/en — fix drift and document new features (#6157)

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

docs/en/developer/codebase.md

@@ -2,7 +2,7 @@
 title: Codebase
 parent: Developer Guide
 nav_order: 2
-last_updated: 2026-06-11
+last_updated: 2026-07-08
 aliases:
   - repository-layout
   - project-structure
@@ -60,10 +60,9 @@ Meshtastic-Android/
 ├── screenshot-tests/       # Compose Preview screenshot tests (visual-regression gate)
 ├── docs-screenshots/       # Doc-framed composition screenshots (generate-only, not CI-gated)
 ├── build-logic/            # Convention plugins and build helpers
-│   ├── convention/
-│   └── flatpak/
+│   └── convention/
 ├── docs/                   # Documentation source (markdown)
-│   └── en/                 # English sources (translations land in docs/{lang}/)
+│   └── en/                 # English source; other locales live under docs/<locale>/user/
 │       ├── user/
 │       └── developer/
 ├── gradle/                 # Gradle wrapper and version catalog
@@ -96,7 +95,7 @@ All build files use Kotlin DSL (`.gradle.kts`). Configuration:
 
 ### Convention Plugins
 
-Located in `build-logic/convention/src/main/kotlin/org/meshtastic/buildlogic/`:
+Located in `build-logic/convention/src/main/kotlin/`:
 
 | Plugin | Purpose |
 |--------|---------|