feat: expand companion platform, device controls, and memoir workflows

Add customer and operator login, BLE provisioning, device fleet controls, call memory, memoir generation, and refreshed family and maintenance portals. Include API contracts, migrations, firmware sources, tests, assets, and deployment documentation.

internal/config/dify_test.go

@@ -0,0 +1,28 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestDifyRequiresCompleteCredentialsAndAcceptsSecretFiles(t *testing.T) {
+	t.Setenv("DIFY_ENABLED", "true")
+	t.Setenv("DIFY_BRIDGE_SECRET", "")
+	t.Setenv("DIFY_EXTRACTION_API_KEY", "")
+	t.Setenv("DIFY_MEMOIR_API_KEY", "")
+	if _, err := Load("worker"); err == nil {
+		t.Fatal("enabled workflows accepted missing credentials")
+	}
+	for _, name := range []string{"DIFY_BRIDGE_SECRET", "DIFY_EXTRACTION_API_KEY", "DIFY_MEMOIR_API_KEY"} {
+		file := filepath.Join(t.TempDir(), name)
+		if err := os.WriteFile(file, []byte("private-test-value"), 0600); err != nil {
+			t.Fatal(err)
+		}
+		t.Setenv(name+"_FILE", file)
+	}
+	cfg, err := Load("worker")
+	if err != nil || !cfg.DifyEnabled || cfg.DifyMemoirAPIKey != "private-test-value" {
+		t.Fatalf("secret-file workflow configuration failed: %v", err)
+	}
+}