feat: redesign Clients admin — drag-and-drop, inline edit, tags

Schema:
- Client model: add tags String[] field
- Shared types + Zod schemas updated for tags

API:
- client.create/update: accept tags array
- client.delete: with safety checks (no projects, no children)
- client.batchUpdateSortOrder: batch reorder in transaction

UI (complete redesign of ClientsAdminClient):
- Drag-and-drop reordering via @dnd-kit (sortable)
- Inline editing: click name/sortOrder to edit in-place
- Tag pills: auto-colored by hash, add/remove inline
- Tag auto-suggest from existing tags across all clients
- Sticky "Add Client" input row at top
- Search/filter by name, code, or tag
- Delete with inline confirmation
- Optimistic reorder (instant UI update)
- Full dark theme support

Co-Authored-By: claude-flow <ruv@ruv.net>

pnpm-lock.yaml

@@ -30,6 +30,15 @@ importers:
 
   apps/web:
     dependencies:
+      '@dnd-kit/core':
+        specifier: ^6.3.1
+        version: 6.3.1(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@dnd-kit/sortable':
+        specifier: ^10.0.0
+        version: 10.0.0(@dnd-kit/core@6.3.1(react-dom@19.2.4(react@19.2.4))(react@19.2.4))(react@19.2.4)
+      '@dnd-kit/utilities':
+        specifier: ^3.2.2
+        version: 3.2.2(react@19.2.4)
       '@node-rs/argon2':
         specifier: ^2.0.2
         version: 2.0.2
@@ -471,6 +480,28 @@ packages:
   '@dimforge/rapier3d-compat@0.12.0':
     resolution: {integrity: sha512-uekIGetywIgopfD97oDL5PfeezkFpNhwlzlaEYNOA0N6ghdsOvh/HYjSMek5Q2O1PYvRSDFcqFVJl4r4ZBwOow==}
 
+  '@dnd-kit/accessibility@3.1.1':
+    resolution: {integrity: sha512-2P+YgaXF+gRsIihwwY1gCsQSYnu9Zyj2py8kY5fFvUM1qm2WA2u639R6YNVfU4GWr+ZM5mqEsfHZZLoRONbemw==}
+    peerDependencies:
+      react: '>=16.8.0'
+
+  '@dnd-kit/core@6.3.1':
+    resolution: {integrity: sha512-xkGBRQQab4RLwgXxoqETICr6S5JlogafbhNsidmrkVv2YRs5MLwpjoF2qpiGjQt8S9AoxtIV603s0GIUpY5eYQ==}
+    peerDependencies:
+      react: '>=16.8.0'
+      react-dom: '>=16.8.0'
+
+  '@dnd-kit/sortable@10.0.0':
+    resolution: {integrity: sha512-+xqhmIIzvAYMGfBYYnbKuNicfSsk4RksY2XdmJhT+HAC01nix6fHCztU68jooFiMUB01Ky3F0FyOvhG/BZrWkg==}
+    peerDependencies:
+      '@dnd-kit/core': ^6.3.0
+      react: '>=16.8.0'
+
+  '@dnd-kit/utilities@3.2.2':
+    resolution: {integrity: sha512-+MKAJEOfaBe5SmV6t34p80MMKhjvUz0vRrvVJbPT0WElzaOJ/1xs+D+KDv+tD/NE5ujfrChEcshd4fLn0wpiqg==}
+    peerDependencies:
+      react: '>=16.8.0'
+
   '@emnapi/core@1.8.1':
     resolution: {integrity: sha512-AvT9QFpxK0Zd8J0jopedNm+w/2fIzvtPKPjqyw9jwvBaReTTqPBk9Hixaz7KbjimP+QNz605/XnjFcDAL2pqBg==}
 
@@ -4574,6 +4605,31 @@ snapshots:
 
   '@dimforge/rapier3d-compat@0.12.0': {}
 
+  '@dnd-kit/accessibility@3.1.1(react@19.2.4)':
+    dependencies:
+      react: 19.2.4
+      tslib: 2.8.1
+
+  '@dnd-kit/core@6.3.1(react-dom@19.2.4(react@19.2.4))(react@19.2.4)':
+    dependencies:
+      '@dnd-kit/accessibility': 3.1.1(react@19.2.4)
+      '@dnd-kit/utilities': 3.2.2(react@19.2.4)
+      react: 19.2.4
+      react-dom: 19.2.4(react@19.2.4)
+      tslib: 2.8.1
+
+  '@dnd-kit/sortable@10.0.0(@dnd-kit/core@6.3.1(react-dom@19.2.4(react@19.2.4))(react@19.2.4))(react@19.2.4)':
+    dependencies:
+      '@dnd-kit/core': 6.3.1(react-dom@19.2.4(react@19.2.4))(react@19.2.4)
+      '@dnd-kit/utilities': 3.2.2(react@19.2.4)
+      react: 19.2.4
+      tslib: 2.8.1
+
+  '@dnd-kit/utilities@3.2.2(react@19.2.4)':
+    dependencies:
+      react: 19.2.4
+      tslib: 2.8.1
+
   '@emnapi/core@1.8.1':
     dependencies:
       '@emnapi/wasi-threads': 1.1.0