security: mask terminal password input and implement requests excepti…

[Darshan-paapani06]

🚀 Purpose

Upgrades terminal operational privacy and implements resilient connection exception tracking layouts inside the local investigator registration client script.

🛠️ Changes Made

• Credential Echo Obfuscation: Exchanged raw input routines for standard getpass.getpass() modules to hide sensitive password text entries from screen visibility mirrors.
• Request Exception Interception: Wrapped HTTP routing channels inside dedicated RequestException boundaries to catch server drops gracefully.
• Connection Latency Timeout Bounds: Mounted an explicit timeout=15 threshold limit to protect client processes from lockups on stalled endpoints.
• Unpacked Response Formats: Added deep response.json() extraction filters to guard the output reporting arrays from un-formatted crash exceptions.

🧪 Verification Done

• Verified input masking flows locally; terminal suppresses keystroke visibility indicators perfectly during security configuration steps.
• Disconnected the Flask host framework purposefully; the client catches the socket gap cleanly, spitting out a readable error summary instead of throwing a raw thread trace down the shell console.