Add methodology settings page with golden ratios, discussion rules, and checklists

New /methodology page with 3 tabs for viewing and editing decision
writing methodology. Uses DB override pattern: hardcoded Python
constants serve as defaults, edits saved to appeal_type_rules table,
delete restores default.

Backend: 3 generic endpoints (GET/PUT/DELETE /api/methodology/{category}/{key})
with validation per category type.

Frontend: methodology.ts hooks, GoldenRatiosPanel (number inputs per
outcome/section), DiscussionRulesPanel (accordion with textarea per
rule), ContentChecklistsPanel (markdown editor with preview toggle).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web-ui/src/components/app-shell.tsx

@@ -25,6 +25,7 @@ type NavItem = {
 const NAV_ITEMS: NavItem[] = [
   { href: "/",            label: "בית"         },
   { href: "/training",    label: "אימון סגנון" },
+  { href: "/methodology", label: "מתודולוגיה" },
   { href: "/skills",      label: "מיומנויות"  },
   { href: "/diagnostics", label: "אבחון"       },
   { href: "/settings",    label: "הגדרות"      },