feat: rebrand to SecureBit.chat due to name conflict

BREAKING CHANGE: Project renamed from LockBit.chat to SecureBit.chat

- Changed project name to avoid confusion with LockBit ransomware group
- Updated all documentation, branding, and references
- Maintained all existing functionality and security features
- Domain migration planned to securebit.chat

Reason: The LockBit name became associated with a notorious ransomware
group, causing conflicts on platforms and potential confusion for users.
SecureBit better reflects our mission of providing secure P2P messaging
while avoiding negative associations.

This change affects:
- README.md and all documentation
- Package.json name field
- Brand assets and logos
- Website references
- Social media handles

Core functionality remains unchanged:
✅ 12-layer military-grade security
✅ Lightning Network integration
✅ P2P WebRTC architecture
✅ Open source MIT license

src/components/ui/Header.jsx

@@ -105,7 +105,7 @@ const EnhancedMinimalHeader = ({
                         React.createElement('h1', {
                             key: 'title',
                             className: 'text-lg sm:text-xl font-semibold text-primary'
-                        }, 'LockBit.chat'),
+                        }, 'SecureBit.chat'),
                         React.createElement('p', {
                             key: 'subtitle',
                             className: 'text-xs sm:text-sm text-muted hidden sm:block'

src/crypto/EnhancedSecureCryptoUtils.js

@@ -1275,7 +1275,7 @@ class EnhancedSecureCryptoUtils {
             const encoder = new TextEncoder();
             
             // Enhanced context info with version and additional entropy
-            const contextInfo = encoder.encode('LockBit.chat v4.0 Enhanced Security Edition');
+            const contextInfo = encoder.encode('SecureBit.chat v4.0 Enhanced Security Edition');
             
             // Derive master shared secret with enhanced parameters
             // Try SHA-384 first, fallback to SHA-256

src/session/PayPerSessionManager.js

@@ -445,7 +445,7 @@ class PayPerSessionManager {
                 body: JSON.stringify({
                     out: false, // incoming payment
                     amount: pricing.sats,
-                    memo: `LockBit.chat ${sessionType} session (${pricing.hours}h) - ${Date.now()}`,
+                    memo: `SecureBit.chat ${sessionType} session (${pricing.hours}h) - ${Date.now()}`,
                     unit: 'sat',
                     expiry: this.verificationConfig.invoiceExpiryMinutes * 60 // В секундах
                 }),
@@ -470,9 +470,9 @@ class PayPerSessionManager {
                 sessionType: sessionType,
                 createdAt: Date.now(),
                 expiresAt: Date.now() + (this.verificationConfig.invoiceExpiryMinutes * 60 * 1000),
-                description: data.description || data.memo || `LockBit.chat ${sessionType} session`,
+                description: data.description || data.memo || `SecureBit.chat ${sessionType} session`,
                 bolt11: data.bolt11 || data.payment_request,
-                memo: data.memo || `LockBit.chat ${sessionType} session`
+                memo: data.memo || `SecureBit.chat ${sessionType} session`
             };
 
         } catch (error) {
@@ -502,7 +502,7 @@ class PayPerSessionManager {
             sessionType: sessionType,
             createdAt: Date.now(),
             expiresAt: Date.now() + (5 * 60 * 1000), // 5 минут
-            description: `LockBit.chat ${sessionType} session (DEMO)`,
+            description: `SecureBit.chat ${sessionType} session (DEMO)`,
             isDemo: true
         };
     }
@@ -1242,7 +1242,7 @@ class PayPerSessionManager {
 
         return {
             amount: pricing.sats,
-            memo: `LockBit.chat ${sessionType} session (${pricing.hours}h) - ${timestamp}`,
+            memo: `SecureBit.chat ${sessionType} session (${pricing.hours}h) - ${timestamp}`,
             sessionType: sessionType,
             timestamp: timestamp,
             paymentHash: paymentHash,