PR 1: Add --no-input flag for non-interactive login

[natefikru]

Summary

• Adds global --no-input flag (with TVC_NO_INPUT env var) that disables interactive prompts and suppresses non-essential output
• Adds --org-id, --alias, and --api-env flags to the login command for non-interactive org setup
• Adds clap constraints (conflicts_with, requires) to prevent invalid flag combinations
• Adds info() helper that suppresses status messages when --no-input is set

Test plan

• cargo test --test login (7 tests: non-interactive flow, api-env, status suppression, flag conflicts)
• cargo test --test global_flags (2 tests: flag parsing and recognition)
• cargo clippy --all-targets --all-features -- -D warnings
• Manual: tvc login --no-input --org-id <ID> creates config without prompts