feat(license): default to Solo tier when no license present

Allow vault to run without a license file by defaulting to Solo tier (free). When no license is found, treat it as valid with Solo tier limits instead of returning an error. This enables free usage with basic features.

license/license.go

@@ -118,7 +118,10 @@ func (m *Manager) Load() error {
 	}
 
 	if licenseData == "" {
-		return ErrNoLicense
+		// No license file - use Solo tier (free)
+		log.Info("No license file found, using Solo tier (free)")
+		m.license = nil // Solo tier uses nil license with defaults
+		return nil
 	}
 
 	// Parse license
@@ -144,7 +147,8 @@ func (m *Manager) Load() error {
 // Validate validates the current license
 func (m *Manager) Validate() error {
 	if m.license == nil {
-		return ErrNoLicense
+		// No license = Solo tier (free), which is valid
+		return nil
 	}
 
 	// Skip signature validation in development mode
@@ -210,7 +214,14 @@ func (m *Manager) verifySignature() error {
 // Info returns information about the current license
 func (m *Manager) Info() *Info {
 	if m.license == nil {
-		return nil
+		// Return Solo tier info for unlicensed installations
+		return &Info{
+			Valid:       true,
+			Tier:        string(TierSolo),
+			ExpiresAt:   0, // Never expires
+			GracePeriod: false,
+			Limits:      DefaultLimitsForTier(TierSolo),
+		}
 	}
 
 	now := time.Now().Unix()