Initial scaffold with per-nameserver DNS monitoring model

Full project structure following upaas conventions: uber/fx DI, go-chi
routing, slog logging, Viper config. State persisted as JSON file with
per-nameserver record tracking for inconsistency detection. Stub
implementations for resolver, portcheck, tlscheck, and watcher.

internal/globals/globals.go

@@ -0,0 +1,62 @@
+// Package globals provides build-time variables and application-wide constants.
+package globals
+
+import (
+	"sync"
+
+	"go.uber.org/fx"
+)
+
+// Package-level variables set from main via ldflags.
+// These are intentionally global to allow build-time injection using -ldflags.
+//
+//nolint:gochecknoglobals // Required for ldflags injection at build time
+var (
+	mu        sync.RWMutex
+	appname   string
+	version   string
+	buildarch string
+)
+
+// Globals holds build-time variables for dependency injection.
+type Globals struct {
+	Appname   string
+	Version   string
+	Buildarch string
+}
+
+// New creates a new Globals instance from package-level variables.
+func New(_ fx.Lifecycle) (*Globals, error) {
+	mu.RLock()
+	defer mu.RUnlock()
+
+	return &Globals{
+		Appname:   appname,
+		Version:   version,
+		Buildarch: buildarch,
+	}, nil
+}
+
+// SetAppname sets the application name.
+func SetAppname(name string) {
+	mu.Lock()
+	defer mu.Unlock()
+
+	appname = name
+}
+
+// SetVersion sets the version.
+func SetVersion(ver string) {
+	mu.Lock()
+	defer mu.Unlock()
+
+	version = ver
+}
+
+// SetBuildarch sets the build architecture.
+func SetBuildarch(arch string) {
+	mu.Lock()
+	defer mu.Unlock()
+
+	buildarch = arch
+}