docs: add Transcription, Media Import, Account Security, and Setup Wizard guides

[level09]

Adds four guide pages for public features that previously had no documentation. All content was verified against the code and kept free of secrets and internal infrastructure details.

• Transcription (guide/transcription.md) — local Whisper transcription of audio/video, model trade-offs, language detection, reviewing/correcting transcripts, searchability.
• Media Import (guide/media-import.md) — bulk creation of Bulletins from media files via upload or server path, processing options (parse/OCR/transcribe), dedup. Includes the admin-only server-path import with the ETL_ALLOWED_PATH restriction and a warning to scope it to a dedicated folder.
• Account Security (guide/account-security.md) — 2FA (TOTP) with recovery codes, passkeys/security keys, Google SSO, password policy, login CAPTCHA, and session behaviour. Framed as what users self-manage vs. what admins enforce.
• Setup Wizard (deployment/setup-wizard.md) — the first-run browser wizard, what each step covers, and the CLI alternative.

Sidebar entries added under the relevant sections. Verified with vitepress build (no dead links).

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[apodacaduron]

Awesome, super useful documentation