feat: Add multi-host config and dynamic project scanning

Backend:
- Load hosts from config/hosts.json
- New /api/hosts endpoint listing available hosts
- Dynamic project scanning with configurable depth
- Support for local and SSH hosts (SSH execution coming next)

Frontend (by Web-UI Claude):
- Slash commands: /clear, /help, /export, /scroll, /new, /info
- Chat export as Markdown

Config:
- hosts.json defines hosts with connection info and base paths
- hosts.example.json as template (real config is gitignored)
- Each host has name, description, color, icon, basePaths

Next steps:
- SSH command execution for remote hosts
- Frontend host selector UI
- Multi-agent collaboration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

config/hosts.example.json

@@ -0,0 +1,37 @@
+{
+  "hosts": {
+    "local": {
+      "name": "Local",
+      "description": "Local machine",
+      "connection": {
+        "type": "local"
+      },
+      "basePaths": [
+        "/projects",
+        "/docker"
+      ],
+      "color": "#f97316",
+      "icon": "cat"
+    },
+    "remote-example": {
+      "name": "Remote Server",
+      "description": "Example remote host via SSH",
+      "connection": {
+        "type": "ssh",
+        "host": "192.168.1.100",
+        "user": "username",
+        "port": 22
+      },
+      "basePaths": [
+        "/home/username/projects"
+      ],
+      "color": "#22c55e",
+      "icon": "server"
+    }
+  },
+  "defaults": {
+    "host": "local",
+    "scanSubdirs": true,
+    "maxDepth": 1
+  }
+}