feat: add bash infra functions — Gitea, Android SDK, Mantine, Capacitor

Nuevas funciones bash: gestión Gitea (create_repo, list_repos, add_collaborator,
push_directory), install_android_sdk, install_mantine, frontend_doctor.
Pipelines: capacitor_build_apk y gitea_init_app.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bash/functions/infra/frontend_doctor.md

@@ -0,0 +1,54 @@
+---
+name: frontend_doctor
+kind: function
+lang: bash
+domain: infra
+version: "1.0.0"
+purity: impure
+signature: "frontend_doctor(project_dir: string) -> diagnostics_stdout"
+description: "Diagnostica la salud de un proyecto frontend Mantine. Verifica Node, React, Mantine, PostCSS, TypeScript, vite.config y detecta residuos de shadcn/@base-ui. Imprime tabla de checks con exit code 0/1."
+tags: [frontend, mantine, doctor, diagnostics, health, validation]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: "error_go_core"
+imports: []
+params:
+  - name: project_dir
+    desc: "directorio del proyecto frontend con package.json"
+output: "tabla de checks con ✓/✗ por cada validación y resumen final"
+tested: false
+tests: []
+test_file_path: ""
+file_path: "bash/functions/infra/frontend_doctor.sh"
+---
+
+## Ejemplo
+
+```bash
+# Diagnosticar un proyecto
+bash frontend_doctor.sh ./apps/rapid_dashboards/frontend
+
+# Output:
+# === Frontend Doctor: ./apps/rapid_dashboards/frontend ===
+#
+#   ✓  Node >= 18                          22.12.0
+#   ✓  Package manager detected            pnpm
+#   ✓  node_modules present
+#   ✓  @mantine/core                       7.17.0
+#   ✓  @mantine/hooks
+#   ✓  @mantine/charts
+#   ✓  React >= 18                         19.2.4
+#   ✓  postcss.config present
+#   ✓  TypeScript >= 5                     6.0.2
+#   ✓  vite.config present
+#   ✓  No shadcn residual
+#   ✓  No @base-ui residual
+#
+#   Resultado: todo OK
+```
+
+## Notas
+
+Checks informativos, no modifica nada. Util para validar que un proyecto esta correctamente configurado despues de instalar Mantine o migrar desde shadcn. Exit code 0 si todo OK, 1 si hay problemas.