feat: epique v1.1.0 — onboarding, copilot & roles aichat (am setup)

F1 — Wizard d'onboarding (src/setup.rs) :
- am setup : provider (anthropic, openai, deepseek, google, ollama, custom),
  token masque (rpassword) -> keyring OS (jamais en clair), modele par defaut
  (liste declaree + champ libre), ping API non-bloquant
- Declencheurs non-bloquants : am ai / am ask et banner REPL proposent
  am setup quand aucun provider n'est configure ; re-executable (mode revoir)
- settings.default_provider + providers.* ecrits via persist_setting

F2 — Integration aichat :
- Etape wizard 'Installer le moteur IA (aichat) ? [Y/n]' -> am install aichat
- am ai sans aichat -> 'aichat est manquant. Installer ? [Y/n]'
- install.ps1/install.sh enchainent sur am setup si stdin interactif

F3 — Roles copilot aichat (src/roles.rs) :
- 6 agents generes dans ~/.config/aichat/agents (ou %APPDATA%\aichat\agents) :
  am-copilot, am-operator, am-dev, am-do, am-analyst, am-orchestrator
- Prompts bilingues (FR defaut) privilegiant les contrats --json ; le prompt
  am-copilot embarque la liste des commandes am
- am ai --role <nom> (valide le fichier genere, passe --agent a aichat),
  completion REPL ; config aichat creee seulement si absente
- Câblage complet : cli, dispatch, help, REPL, tip, man (am-setup.1), i18n

Tests : 450 verts (roles + setup unitaires, ai_test ajustes locale-agnostic)
v1.1.0 ; ROADMAP axe 14 + maintenance note ; README Premier lancement

Cargo.lock

@@ -21,7 +21,7 @@ dependencies = [
 
 [[package]]
 name = "agent-manager"
-version = "1.0.6"
+version = "1.1.0"
 dependencies = [
  "anyhow",
  "base64",
@@ -36,6 +36,7 @@ dependencies = [
  "nu-ansi-term",
  "ratatui",
  "reedline",
+ "rpassword",
  "semver",
  "serde",
  "serde_json",
@@ -1779,6 +1780,27 @@ version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "323c417e1d9665a65b263ec744ba09030cfb277e9daa0b018a4ab62e57bc8189"
 
+[[package]]
+name = "rpassword"
+version = "7.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2da316a15f47e3d053de9cb2c439650bd8fa4aaeb9365f2e5f27f492ff73c196"
+dependencies = [
+ "libc",
+ "rtoolbox",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "rtoolbox"
+version = "0.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50a0e551c1e27e1731aba276dbeaeac73f53c7cd34d1bda485d02bd1e0f36844"
+dependencies = [
+ "libc",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "rustc_version"
 version = "0.4.1"