workout generator audit: rules engine, structure rules, split patterns, injury UX, metadata cleanup

- Add rules_engine.py with quantitative rules for all 8 workout types
- Add quality gate retry loop in generate_single_workout()
- Expand calibrate_structure_rules to all 120 combinations (8 types × 5 goals × 3 sections)
- Wire WeeklySplitPattern DB records into _pick_weekly_split()
- Enforce movement patterns from WorkoutStructureRule in exercise selection
- Add straight-set strength support (single main lift, 4-6 rounds)
- Add modality consistency check for duration-dominant workout types
- Add InjuryStep component to onboarding and preferences
- Add sibling exercise exclusion in regenerate and preview_day endpoints
- Display generator warnings on dashboard
- Expand fix_rep_durations, fix_exercise_flags, fix_movement_pattern_typo
- Add audit_exercise_data and check_rules_drift management commands
- Add Next.js frontend with dashboard, onboarding, preferences, history pages
- Add generator app with ML-powered workout generation pipeline
- 96 new tests across 7 test modules

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

werkout-frontend/components/ui/Badge.tsx

@@ -0,0 +1,35 @@
+import type { ReactNode } from "react";
+
+type BadgeVariant = "default" | "success" | "warning" | "error" | "accent";
+
+interface BadgeProps {
+  variant?: BadgeVariant;
+  children: ReactNode;
+  className?: string;
+}
+
+const variantClasses: Record<BadgeVariant, string> = {
+  default: "bg-zinc-700 text-zinc-300",
+  success: "bg-green-500/20 text-green-400",
+  warning: "bg-amber-500/20 text-amber-400",
+  error: "bg-red-500/20 text-red-400",
+  accent: "bg-[rgba(57,255,20,0.1)] text-[#39FF14]",
+};
+
+export function Badge({
+  variant = "default",
+  children,
+  className = "",
+}: BadgeProps) {
+  return (
+    <span
+      className={`
+        inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium
+        ${variantClasses[variant]}
+        ${className}
+      `}
+    >
+      {children}
+    </span>
+  );
+}