refactor: rename project from AgenticRAG to DocuMente

## Changes
- Update all references from AgenticRAG to DocuMente
- Update README.md with new project description and structure
- Update LICENSE with new project name
- Update API title and descriptions in main.py
- Update frontend components (Layout, Login, Dashboard, Settings)
- Update static HTML page
- Update all documentation files (prd-v2.md, frontend-plan.md, etc.)
- Update test files with new project name
- Update docker-compose.yml, Dockerfile, requirements.txt

## SEO Benefits
- DocuMente combines 'Documento' and 'Mente' (Italian for Document and Mind)
- Memorable and brandable name
- Reflects the core functionality: AI-powered document intelligence

🎉 Project officially renamed to DocuMente!

frontend-plan.md

@@ -1,8 +1,8 @@
-# Piano di Sviluppo Frontend - AgenticRAG
+# Piano di Sviluppo Frontend - DocuMente
 
 ## 📋 Overview
 
-Sviluppo di un'interfaccia web moderna per AgenticRAG utilizzando **React 18 + Vite + TypeScript + Tailwind CSS + shadcn/ui**.
+Sviluppo di un'interfaccia web moderna per DocuMente utilizzando **React 18 + Vite + TypeScript + Tailwind CSS + shadcn/ui**.
 
 ---
 
@@ -319,7 +319,7 @@ npm run preview
 ### Dashboard
 ```
 ┌─────────────────────────────────────────────────────────┐
-│  🧠 AgenticRAG      Dashboard  Documents  Chat  Settings│
+│  🧠 DocuMente      Dashboard  Documents  Chat  Settings│
 ├─────────────────────────────────────────────────────────┤
 │                                                         │
 │  ┌─────────────┐ ┌─────────────┐ ┌─────────────┐       │
@@ -343,7 +343,7 @@ npm run preview
 ### Chat Interface
 ```
 ┌─────────────────────────────────────────────────────────┐
-│  🧠 AgenticRAG                              [User ▼]   │
+│  🧠 DocuMente                              [User ▼]   │
 ├─────────────────────────────────────────────────────────┤
 │  💬 Chat 1                    ┌─────────────────────┐   │
 │  💬 Chat 2                    │                     │   │