feat: add comprehensive OpenCode API endpoint proxies

Added proxy routes for all OpenCode internal API endpoints to support
full application functionality when accessed via session manager:
- project, agent, config, model endpoints
- thread, chat, conversation endpoints
- command, mcp, lsp, vcs endpoints
- permission, question, event, status endpoints
- internal session endpoint (distinct from container sessions)

Also updated Caddyfile for routing configuration.

nginx/Caddyfile

@@ -9,6 +9,12 @@ http://localhost {
         reverse_proxy session-manager:8000
     }
 
+    # OpenCode internal session API (without session_id in path)
+    # Must be BEFORE /session/{session_id}* to match first
+    handle /session {
+        reverse_proxy session-manager:8000
+    }
+
     # Session-specific routing - proxy to session manager for dynamic routing
     handle /session/{session_id}* {
         reverse_proxy session-manager:8000
@@ -51,6 +57,124 @@ http://localhost {
         reverse_proxy session-manager:8000
     }
 
+    # Additional OpenCode API endpoints for root-path operation
+    handle /agent {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /agent/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /config {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /config/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /model {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /model/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /thread/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /chat/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /tree {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /tree/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /conversation {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /conversation/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /project/* {
+        reverse_proxy session-manager:8000
+    }
+
+    # OpenCode communication endpoints for message sending
+    handle /command {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /command/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /mcp {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /mcp/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /lsp {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /lsp/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /vcs {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /vcs/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /permission {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /permission/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /question {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /question/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /event {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /event/* {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /status {
+        reverse_proxy session-manager:8000
+    }
+
+    handle /status/* {
+        reverse_proxy session-manager:8000
+    }
+
     # Health check
     handle /health {
         reverse_proxy session-manager:8000