refactor(admin): split sdk-flow page.tsx into colocated components

Extract BetriebOverviewPanel, DetailPanel, FlowCanvas, FlowToolbar,
StepTable, useFlowGraph hook and helpers into _components/ so page.tsx
drops from 1019 to 156 LOC (under the 300 soft target).

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

admin-compliance/app/sdk/sdk-flow/_components/helpers.ts

@@ -0,0 +1,58 @@
+import { SDK_FLOW_STEPS, type SDKFlowStep } from '../flow-data'
+
+// =============================================================================
+// LAYOUT
+// =============================================================================
+
+export const PACKAGE_ORDER: SDKFlowStep['package'][] = [
+  'vorbereitung',
+  'analyse',
+  'dokumentation',
+  'rechtliche-texte',
+  'betrieb',
+]
+
+export const PACKAGE_X_OFFSET: Record<string, number> = {
+  vorbereitung: 0,
+  analyse: 320,
+  dokumentation: 640,
+  'rechtliche-texte': 960,
+  betrieb: 1280,
+}
+
+export const NODE_WIDTH = 200
+export const NODE_HEIGHT = 70
+export const STEP_Y_SPACING = 100
+export const STEP_Y_START = 100
+
+export function getStepPosition(step: SDKFlowStep): { x: number; y: number } {
+  const packageSteps = SDK_FLOW_STEPS
+    .filter(s => s.package === step.package)
+    .sort((a, b) => a.seq - b.seq)
+  const idx = packageSteps.findIndex(s => s.id === step.id)
+
+  return {
+    x: PACKAGE_X_OFFSET[step.package] + 40,
+    y: STEP_Y_START + idx * STEP_Y_SPACING,
+  }
+}
+
+// =============================================================================
+// HELPERS - FERTIGSTELLUNGSGRAD
+// =============================================================================
+
+export function completionColor(pct: number): string {
+  if (pct >= 70) return '#22c55e'   // green
+  if (pct >= 50) return '#84cc16'   // lime
+  if (pct >= 35) return '#f59e0b'   // amber
+  return '#ef4444'                  // red
+}
+
+export function completionLabel(pct: number): string {
+  if (pct >= 70) return 'Fortgeschritten'
+  if (pct >= 50) return 'In Entwicklung'
+  if (pct >= 35) return 'Begonnen'
+  return 'Frühe Phase'
+}
+
+export type PackageFilter = 'alle' | SDKFlowStep['package']