chore: estructura inicial del MVP

Backend (Express + MariaDB) y frontend (React + Vite, identidad Fluent/Windows) con el
nucleo funcional: seguridad, organizacion, proyectos, actividades, subtareas, dependencias,
dashboard, calendario, gantt, comentarios, adjuntos, notificaciones in-app y catalogos.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,63 @@
+# --- Secrets & env ---
+.env
+.env.*
+!.env.example
+backend/.env
+backend/.env.*
+!backend/.env.example
+frontend/.env
+frontend/.env.*
+!frontend/.env.example
+
+# --- Dependencies ---
+node_modules/
+backend/node_modules/
+frontend/node_modules/
+
+# --- Build outputs ---
+dist/
+build/
+coverage/
+frontend/dist/
+backend/dist/
+
+# --- Logs ---
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+backend/logs/
+
+# --- Persistent app data ---
+storage/
+backend/storage/
+backend/uploads/
+backend/tmp/
+backend/temp/
+
+# --- Editor / OS ---
+.DS_Store
+Thumbs.db
+.token_gitea
+.idea/
+.codex
+.claude/
+.tmp-venv/
+.vscode/*
+!.vscode/extensions.json
+*.swp
+*.swo
+
+# --- Local artifacts / references (NUNCA versionar) ---
+Screenshot_*.png
+test.pdf
+LOCAL_DEPLOY_CONTEXT.md
+SERVIDORES.md
+PORTS_INVENTORY.md
+
+# --- Certificados / llaves ---
+backend/*.p12
+backend/*.pfx