feat: Add staged funding model, financial compute engine, annex slides and UI enhancements

Restructure financial plan from single 200k SAFE to realistic staged funding
(25k Stammkapital, 25k Angel, 200k Wandeldarlehen, 1M Series A = 1.25M total).
Add 60-month compute engine with CAPEX/OPEX accounting, cash constraints,
hardware financing (30% upfront / 70% leasing), and revenue-based hiring caps.
Rebuild TheAskSlide with 4-event funding timeline, update i18n (DE/EN),
chat agent core messages, and add 15 new annex/technology slides with
supporting UI components (KPICard, RunwayGauge, WaterfallChart, etc.).

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

pitch-deck/lib/hooks/useFinancialModel.ts

@@ -0,0 +1,109 @@
+'use client'
+
+import { useState, useEffect, useCallback, useRef } from 'react'
+import { FMScenario, FMResult, FMComputeResponse } from '../types'
+
+export function useFinancialModel() {
+  const [scenarios, setScenarios] = useState<FMScenario[]>([])
+  const [activeScenarioId, setActiveScenarioId] = useState<string | null>(null)
+  const [compareMode, setCompareMode] = useState(false)
+  const [results, setResults] = useState<Map<string, FMComputeResponse>>(new Map())
+  const [loading, setLoading] = useState(true)
+  const [computing, setComputing] = useState(false)
+  const computeTimer = useRef<NodeJS.Timeout | null>(null)
+
+  // Load scenarios on mount
+  useEffect(() => {
+    async function load() {
+      try {
+        const res = await fetch('/api/financial-model')
+        if (res.ok) {
+          const data: FMScenario[] = await res.json()
+          setScenarios(data)
+          const defaultScenario = data.find(s => s.is_default) || data[0]
+          if (defaultScenario) {
+            setActiveScenarioId(defaultScenario.id)
+          }
+        }
+      } catch (err) {
+        console.error('Failed to load financial model:', err)
+      } finally {
+        setLoading(false)
+      }
+    }
+    load()
+  }, [])
+
+  // Compute when active scenario changes
+  useEffect(() => {
+    if (activeScenarioId && !results.has(activeScenarioId)) {
+      compute(activeScenarioId)
+    }
+  }, [activeScenarioId]) // eslint-disable-line react-hooks/exhaustive-deps
+
+  const compute = useCallback(async (scenarioId: string) => {
+    setComputing(true)
+    try {
+      const res = await fetch('/api/financial-model/compute', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ scenarioId }),
+      })
+      if (res.ok) {
+        const data: FMComputeResponse = await res.json()
+        setResults(prev => new Map(prev).set(scenarioId, data))
+      }
+    } catch (err) {
+      console.error('Compute failed:', err)
+    } finally {
+      setComputing(false)
+    }
+  }, [])
+
+  const updateAssumption = useCallback(async (scenarioId: string, key: string, value: number | number[]) => {
+    // Optimistic update in local state
+    setScenarios(prev => prev.map(s => {
+      if (s.id !== scenarioId) return s
+      return {
+        ...s,
+        assumptions: s.assumptions.map(a => a.key === key ? { ...a, value } : a),
+      }
+    }))
+
+    // Save to DB
+    await fetch('/api/financial-model/assumptions', {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ scenarioId, key, value }),
+    })
+
+    // Debounced recompute
+    if (computeTimer.current) clearTimeout(computeTimer.current)
+    computeTimer.current = setTimeout(() => compute(scenarioId), 300)
+  }, [compute])
+
+  const computeAll = useCallback(async () => {
+    for (const s of scenarios) {
+      await compute(s.id)
+    }
+  }, [scenarios, compute])
+
+  const activeScenario = scenarios.find(s => s.id === activeScenarioId) || null
+  const activeResults = activeScenarioId ? results.get(activeScenarioId) || null : null
+
+  return {
+    scenarios,
+    activeScenario,
+    activeScenarioId,
+    setActiveScenarioId,
+    activeResults,
+    results,
+    loading,
+    computing,
+    compareMode,
+    setCompareMode,
+    compute,
+    computeAll,
+    updateAssumption,
+  }
+}