docs(wiki): sync v2.5 overhaul from source
Mirror of reworked wiki/; adds AI-Powered-Tools + Frontmatter-Fields/Vault-Entry-Templates/Advanced-Entry-Gating + Contributing-Translations; removes old AI-Tools page.
Sync wiki to v2.0-beta source + apply doc style guide
Cross-checked every page against current code. Fixed factual drift (settings defaults, slash commands, drawer tab labels, pipeline timings, gating operators/types, Scribe frontmatter, Librarian/Emma coverage). Rewrote prose under the new style guide. Added For-World-Info-Users guide to in-repo wiki.
docs: add Custom Fields, AI Notepad, Setup Wizard pages
- Custom-Fields.md: field schema, operators, tolerance, rule builder, slash commands
- AI-Notepad.md: tag/extract modes, settings, storage, injection flow
- Setup-Wizard.md: 7-page wizard walkthrough with all settings covered
- Slash-Commands.md: add short aliases (dle-b, dle-r, dle-g, dle-h, dle-i) to quick reference
- _Sidebar.md: add new pages to navigation
- Installation.md: fix version requirement 1.12.0 → 1.12.6