feat(mise): Add per-user toolsets to hosts.yaml

Nest each host's toolboxes/tools/configs under users.<username> so
root and xavier can have different tool selections on the same
machine, instead of sharing one profile per host.

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

.chezmoidata/hosts.yaml

@@ -2,43 +2,71 @@
 hosts:
   # PC perso
   intel-nuc-hades-canyon:
-    toolboxes:
-      - terminal
-      - dev-tools
-      - dev-languages
-      - ai
-    tools:
-      - vivid
-      - pipx:vit
-      - pipx:speedtest-cli
-      - pipx:asciinema
-    configs: {}
+    users:
+      xavier:
+        toolboxes:
+          - terminal
+          - dev-tools
+          - dev-languages
+          - ai
+        tools:
+          - vivid
+          - pipx:vit
+          - pipx:speedtest-cli
+          - pipx:asciinema
+        configs: {}
+      root:
+        toolboxes:
+          - terminal
+        tools: []
+        configs: {}
   # Serveur dédié
   cloud:
-    toolboxes:
-      - terminal
-      - dev-tools
-      - dev-languages
-      - ai
-    tools:
-      - pipx:vit
-    configs: {}
+    users:
+      xavier:
+        toolboxes:
+          - terminal
+          - dev-tools
+          - dev-languages
+          - ai
+        tools:
+          - pipx:vit
+        configs: {}
+      root:
+        toolboxes:
+          - terminal
+        tools: []
+        configs: {}
   # Container de dev
   devenv:
-    toolboxes:
-      - terminal
-      - dev-tools
-      - dev-languages
-      - devops
-      - ai
-    tools:
-      - sops
-      - age
-      - cargo:rage
-    configs: {}
+    users:
+      xavier:
+        toolboxes:
+          - terminal
+          - dev-tools
+          - dev-languages
+          - devops
+          - ai
+        tools:
+          - sops
+          - age
+          - cargo:rage
+        configs: {}
+      root:
+        toolboxes:
+          - terminal
+        tools: []
+        configs: {}
   termux-debian:
-    toolboxes:
-      - terminal
-      - dev-tools
-    tools: {}
-    configs: {}
+    users:
+      xavier:
+        toolboxes:
+          - terminal
+          - dev-tools
+        tools: {}
+        configs: {}
+      root:
+        toolboxes:
+          - terminal
+        tools: []
+        configs: {}