feat: harden loose-offline sync for user JWT, schema, and console ops

Enable Binding-scoped agent push/pull, empty-table schema ensure, SyncPage inspect/drop-table, default module import, and agent-bound publish docs from the 宇恒联调意见.

Co-authored-by: Cursor <cursoragent@cursor.com>

platform/internal/dbsync/dialect_test.go

@@ -0,0 +1,31 @@
+package dbsync
+
+import "testing"
+
+func TestNormalizeSQLiteDSN(t *testing.T) {
+	got := normalizeSQLiteDSN(`file:E:\data\remote.db`)
+	if got != "file:E:/data/remote.db?_pragma=busy_timeout(5000)" {
+		t.Fatalf("got %q", got)
+	}
+	got = normalizeSQLiteDSN(`E:\data\remote.db`)
+	if got != "file:E:/data/remote.db?_pragma=busy_timeout(5000)" {
+		t.Fatalf("bare path got %q", got)
+	}
+	got = normalizeSQLiteDSN(`file:E:/data/remote.db?_pragma=foreign_keys(1)`)
+	if got != "file:E:/data/remote.db?_pragma=foreign_keys(1)&_pragma=busy_timeout(5000)" {
+		t.Fatalf("keep query got %q", got)
+	}
+}
+
+func TestIsRetryable(t *testing.T) {
+	if !IsRetryable(Retryable("x")) {
+		t.Fatal("expected retryable")
+	}
+	if IsRetryable(fmtError("plain")) {
+		t.Fatal("plain should not")
+	}
+}
+
+type fmtError string
+
+func (e fmtError) Error() string { return string(e) }