Three independent fixes batched together:
1. hermes auth add crashes on non-interactive stdin (#10468)
input() for the label prompt was called without checking isatty().
In scripted/CI environments this raised EOFError. Fix: check
sys.stdin.isatty() and fall back to the computed default label.
2. Subcommand help prints twice (#10230)
'hermes dashboard -h' printed help text twice because the
SystemExit(0) from argparse was caught by the fallback retry
logic, which re-parsed and printed help again. Fix: re-raise
SystemExit with code 0 (help/version) immediately.
3. Duplicate entries in /model picker (#10526, #9545)
- Kimi showed 2x because kimi-coding and kimi-coding-cn both
mapped to the same models.dev ID. Fix: track seen mdev_ids
and skip aliases.
- Providers could show 2-3x from case-variant slugs across the
four loading paths. Fix: normalize all seen_slugs membership
checks and insertions to lowercase.
Closes#10468, #10230, #10526, #9545
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