Enhance network resilience for mobile scenarios in HMAC File Server 3.2

- Introduced fast detection and quality monitoring for network changes.
- Added predictive switching to proactively handle network failures.
- Updated configuration examples and README for mobile network resilience.
- Enhanced network resilience settings in Podman configuration.
- Created a new configuration file for optimized mobile network resilience.

config-network-resilience-enhanced.toml

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+# HMAC File Server - Enhanced Network Resilience Configuration
+# Optimized for mobile devices and network switching scenarios
+
+[server]
+listen_address = "8080"
+storage_path = "/opt/hmac-file-server/data/uploads"
+networkevents = true                # REQUIRED: Enable network monitoring
+
+[uploads]
+allowed_extensions = [".zip", ".rar", ".7z", ".tar.gz", ".tgz", ".gpg", ".enc", ".pgp", ".txt", ".pdf", ".png", ".jpg", ".jpeg", ".gif", ".bmp", ".tiff", ".svg", ".webp", ".wav", ".mp4", ".avi", ".mkv", ".mov", ".wmv", ".flv", ".webm", ".mpeg", ".mpg", ".m4v", ".3gp", ".3g2", ".mp3", ".ogg", ".doc", ".docx"]
+chunked_uploads_enabled = true
+chunk_size = "32MB"                 # Optimized chunk size for mobile
+resumable_uploads_enabled = true
+max_resumable_age = "72h"           # Extended for mobile scenarios
+sessiontimeout = "90m"              # Longer sessions for mobile
+maxretries = 5                      # More retries for mobile networks
+
+# Enhanced upload resilience settings for mobile
+session_persistence = true
+session_recovery_timeout = "600s"   # 10 minutes for mobile switches
+client_reconnect_window = "300s"    # 5 minutes reconnect window
+upload_slot_ttl = "7200s"          # 2 hours slot validity
+retry_failed_uploads = true
+max_upload_retries = 8              # More retries for cellular
+
+[timeouts]
+readtimeout = "600s"                # 10 minutes for mobile networks
+writetimeout = "600s"               # Extended for cellular uploads
+idletimeout = "1200s"               # 20 minutes idle tolerance
+shutdown = "300s"
+
+# NEW: Enhanced Network Resilience Configuration
+[network_resilience]
+fast_detection = true               # Enable 1-second network change detection
+quality_monitoring = true           # Monitor connection quality (RTT, packet loss)
+predictive_switching = true         # Switch proactively before network fails
+mobile_optimizations = true        # Mobile-friendly thresholds and timeouts
+
+# Timing configuration
+detection_interval = "1s"           # Fast detection interval
+quality_check_interval = "5s"      # How often to check connection quality
+max_detection_interval = "10s"     # Maximum interval during stable periods
+
+[security]
+secret = "f6g4ldPvQM7O2UTFeBEUUj33VrXypDAcsDt0yqKrLiOr5oQW"
+
+[logging]
+level = "info"                      # Set to "debug" to see network resilience details
+file = "/opt/hmac-file-server/data/logs/hmac-file-server.log"
+max_size = 100
+max_backups = 7
+max_age = 30
+compress = true
+
+[deduplication]
+enabled = true
+directory = "/opt/hmac-file-server/data/deduplication"
+maxsize = "1GB"
+
+# Configuration Notes:
+# 1. Set networkevents = true in [server] section to enable network monitoring
+# 2. fast_detection = true enables 1-second polling instead of 5-second polling
+# 3. quality_monitoring = true adds RTT and packet loss monitoring
+# 4. predictive_switching = true switches networks proactively before complete failure
+# 5. mobile_optimizations = true uses mobile-friendly thresholds (higher RTT tolerance, etc.)
+# 6. Extended timeouts and retry counts help with mobile network instability
+# 7. Longer session persistence accommodates network switching delays
+
+# Mobile Network Switching Benefits:
+# • WLAN ↔ 5G IPv6 switching: Fast detection (1s) + predictive switching
+# • Dual connectivity (Wired + WiFi): Quality monitoring selects best interface  
+# • Cellular optimization: Higher RTT/packet loss tolerance + more retries
+# • Session mobility: 10-minute recovery window for IP address changes
+# • Proactive switching: Network degradation detected before complete failure