fix(lint): add nolint directives for safe integer conversions (#361)

## Summary
- Fix gosec G115 warnings for safe uint->int/int64 conversions
- All flagged conversions involve small config values (ports, timeouts,
limits)

## Changes
- `main.go:58`: SMTPPort (0-65535)
- `main.go:71`: ResetRateLimitRequests (typically 3-10)
- `main.go:73`: ResetRateLimitWindowMinutes (typically 60-120)
- `internal/rpc/request_password_reset.go:99`: ResetTokenExpiryMinutes
(typically 15-60)

## Test plan
- CI should pass with gosec checks
- No functional changes

Author: CybotTM

internal/rpc/request_password_reset.go

@@ -96,6 +96,7 @@ func (h *Handler) requestPasswordResetWithIP(params []string, clientIP string) (
 	now := time.Now()
 	// Safe conversion: ResetTokenExpiryMinutes is uint, typically small value (15-60)
 	// Convert to time.Duration for expiration calculation
+	//nolint:gosec // G115: small config value, safe for int64
 	expiryDuration := time.Duration(h.opts.ResetTokenExpiryMinutes) * time.Minute
 	token := &resettoken.ResetToken{
 		Token:            tokenString,

main.go

@@ -55,7 +55,7 @@ func main() {
 
 		// Initialize email service
 		// Safe conversion: SMTPPort is uint, typically 25/587/465 (well within int range)
-		smtpPort := int(opts.SMTPPort)
+		smtpPort := int(opts.SMTPPort) //nolint:gosec // G115: SMTPPort is 0-65535, safe for int
 		emailConfig := email.Config{
 			SMTPHost:     opts.SMTPHost,
 			SMTPPort:     smtpPort,
@@ -68,8 +68,9 @@ func main() {
 
 		// Initialize email-based rate limiter (per-user protection)
 		// Safe conversion: ResetRateLimitRequests is uint, typically small value (3-10)
-		resetRequests := int(opts.ResetRateLimitRequests)
+		resetRequests := int(opts.ResetRateLimitRequests) //nolint:gosec // G115: small config value, safe for int
 		// Safe conversion: ResetRateLimitWindowMinutes is uint, typically 60-120
+		//nolint:gosec // G115: small config value, safe for int64
 		resetWindowDuration := time.Duration(opts.ResetRateLimitWindowMinutes) * time.Minute
 		rateLimiter := ratelimit.NewLimiter(resetRequests, resetWindowDuration)