docs: update docs for apps/ai consolidation, MCP tools refactor, and new features

[devin-ai-integration]

Summary

Updates technical documentation to reflect recent codebase changes since the parent docs PR (#3847), primarily:

• apps/ai → apps/api consolidation (refactor: consolidate apps/ai into apps/api #3852): Renames all references from "AI Server (apps/ai)" to "API Server (apps/api)", updates paths and run commands. Removes the now-deleted TypeScript API section (pnpm -F api dev) from run docs since apps/api/package.json no longer exists on main.
• MCP tools refactor (refactor: replace support MCP tools with create_issue, add_comment, search_issues #3811): Updates support chat tool descriptions from old names (submit_bug_report, submit_feature_request, read_github_data) to current names (create_issue, add_comment, search_issues, list_subscriptions, create_billing_portal_session). Documents MCP prompt support and user confirmation for destructive actions.
• New feature FAQs: Adds entries for multi-session selection/bulk delete (feat(desktop): multi-session selection and bulk delete in timeline #3909), auto-trigger note enhancement (feat(desktop): AI-powered note enhancement with auto-trigger and batch improvements #3903), and calendar event description in metadata (feat: show event description in metadata chip #3840).
• Keyboard shortcuts: Updates quit behavior — ⌘Q (hold) now shows gauge visual overlay, ⌘⇧Q added as "Quit Completely" (fix: use Cmd+Shift+Q for Quit Completely, fix app menu quit handler #3810).

Stacked on #3847 (devin/1770768612-update-docs-recent-changes-2).

Review & Testing Checklist for Human

• Verify pnpm -F api dev removal in 5.run.mdx is correct — the old TypeScript API in apps/api/ was deleted during the consolidation (refactor: consolidate apps/ai into apps/api #3852). Confirm there's no remaining TS dev server that users need to run.
• Verify MCP tool names match deployed code — the PR lists specific tool names (search_issues, create_issue, add_comment, list_subscriptions, create_billing_portal_session). Cross-check against crates/api-support/src/mcp/tools/mod.rs on main.
• Verify keyboard shortcut behavior — confirm ⌘Q (hold) shows a gauge visual and ⌘⇧Q quits completely, matching the docs update.
• Spot-check new FAQ entries — verify multi-select bulk delete uses ⌘+click/⇧+click, auto-trigger summary works after recording stops, and event description shows as metadata chip.

Recommended test plan: open the deployed docs preview, navigate to the updated pages (env, run, features FAQ, technical FAQ, support FAQ, keyboard shortcuts), and confirm each claim against the current app behavior.

Notes

• This is a stacked PR on docs: update technical FAQ, support FAQ, and AI server run instructions #3847. Both need to merge for docs to be fully consistent.
• The "(formerly apps/ai)" parenthetical helps developers familiar with the old name but may become stale over time.

Link to Devin run: https://app.devin.ai/sessions/b44c5d402b8944c0bfc7ac00d7e3b1c2
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[devin-ai-integration]

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