fix(channels): add optional defaultAccount routing

src/line/accounts.test.ts

@@ -100,6 +100,39 @@ describe("LINE accounts", () => {
   });
 
   describe("resolveDefaultLineAccountId", () => {
+    it("prefers channels.line.defaultAccount when configured", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          line: {
+            defaultAccount: "business",
+            accounts: {
+              business: { enabled: true },
+              support: { enabled: true },
+            },
+          },
+        },
+      };
+
+      const id = resolveDefaultLineAccountId(cfg);
+      expect(id).toBe("business");
+    });
+
+    it("normalizes channels.line.defaultAccount before lookup", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          line: {
+            defaultAccount: "Business Ops",
+            accounts: {
+              "business-ops": { enabled: true },
+            },
+          },
+        },
+      };
+
+      const id = resolveDefaultLineAccountId(cfg);
+      expect(id).toBe("business-ops");
+    });
+
     it("returns first named account when default not configured", () => {
       const cfg: OpenClawConfig = {
         channels: {
@@ -115,6 +148,22 @@ describe("LINE accounts", () => {
 
       expect(id).toBe("business");
     });
+
+    it("falls back when channels.line.defaultAccount is missing", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          line: {
+            defaultAccount: "missing",
+            accounts: {
+              business: { enabled: true },
+            },
+          },
+        },
+      };
+
+      const id = resolveDefaultLineAccountId(cfg);
+      expect(id).toBe("business");
+    });
   });
 
   describe("normalizeAccountId", () => {