refactor: serve canvas host on gateway port

src/config/config.ts

@@ -97,7 +97,7 @@ export type CanvasHostConfig = {
   enabled?: boolean;
   /** Directory to serve (default: ~/clawd/canvas). */
   root?: string;
-  /** HTTP port to listen on (default: 18793). */
+  /** HTTP port to listen on (deprecated; Gateway port is used). */
   port?: number;
 };
 
@@ -135,6 +135,11 @@ export type SkillsLoadConfig = {
   extraDirs?: string[];
 };
 
+export type SkillsInstallConfig = {
+  preferBrew?: boolean;
+  nodeManager?: "npm" | "pnpm" | "bun";
+};
+
 export type ClawdisConfig = {
   identity?: {
     name?: string;
@@ -185,6 +190,7 @@ export type ClawdisConfig = {
   canvasHost?: CanvasHostConfig;
   gateway?: GatewayConfig;
   skills?: Record<string, SkillConfig>;
+  skillsInstall?: SkillsInstallConfig;
 };
 
 // New branding path (preferred)
@@ -371,6 +377,14 @@ const ClawdisSchema = z.object({
       extraDirs: z.array(z.string()).optional(),
     })
     .optional(),
+  skillsInstall: z
+    .object({
+      preferBrew: z.boolean().optional(),
+      nodeManager: z
+        .union([z.literal("npm"), z.literal("pnpm"), z.literal("bun")])
+        .optional(),
+    })
+    .optional(),
   skills: z
     .record(
       z.string(),