Update docs for new Pro pricing

[k-finken]

Documentation changes

Gate AI, password auth, and preview deployments to Pro, refresh credit tiers, and sync es/fr/zh translations.

Closes

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Medium Risk
Pricing and plan-gating copy is customer-facing and easy to misread if product behavior diverges; incorrect tier or Starter/Pro boundaries could drive wrong upgrade expectations.

Overview
Updates documentation for the new Pro pricing model across English and es, fr, and zh translations.

Plan gating: The assistant is no longer described as on-by-default with trial credits; it is Pro and above with 10,000 credits/month shared across assistant, agent, and automations. Preview deployments get a Pro+ callout. Password auth moves to Pro+; OAuth/JWT stay Enterprise. Starter is documented as having no AI and no credit purchase path.

Credits: Adds a Plan availability section, notes for legacy credit plans, and replaces tier tables with 10k / 25k / 50k / 100k monthly bundles (drops rollover-cap column from the table in EN; rollover behavior text remains). Sales threshold text shifts from ~108.5k to 100k credits.

Assistant billing (localized configure pages): Removes Hobby trial and credit bundle purchase flows; billing steps point to Usage (app.mintlify.com) and Change your credit tier via Credit packages / Spending controls (zh also aligns terminology from message packages to credits).

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