fix: Timeline — utiliser axios /api relatif au lieu de fetch localhost:8000

Les appels fetch vers http://localhost:8000 ne fonctionnent pas en déploiement
Docker — remplacé par axios avec baseURL='/api' comme le reste de l'app.

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

frontend/src/pages/Timeline.tsx

@@ -1,8 +1,9 @@
 import { useState, useEffect, useCallback } from 'react'
 import { ChevronLeft, ChevronRight, Sparkles, Calendar, Clock, Layers, RefreshCw } from 'lucide-react'
+import axios from 'axios'
 import clsx from 'clsx'
 
-const API = 'http://localhost:8000'
+const api = axios.create({ baseURL: '/api' })
 
 interface MarketEvent {
   id: number
@@ -231,42 +232,42 @@ export default function Timeline() {
   const fetchDay = useCallback(async (d: string) => {
     setLoading(true)
     try {
-      const res = await fetch(`${API}/api/timeline/day/${d}`)
-      if (res.ok) setCtx(await res.json())
-    } finally {
+      const res = await api.get(`/timeline/day/${d}`)
+      setCtx(res.data)
+    } catch { /* ignore */ } finally {
       setLoading(false)
     }
   }, [])
 
   const fetchEvents = useCallback(async () => {
-    const res = await fetch(`${API}/api/timeline/events`)
-    if (res.ok) setAllEvents(await res.json())
+    try {
+      const res = await api.get('/timeline/events')
+      setAllEvents(res.data)
+    } catch { /* ignore */ }
   }, [])
 
   const bootstrap = useCallback(async () => {
-    const res = await fetch(`${API}/api/timeline/bootstrap`, { method: 'POST' })
-    if (res.ok) {
+    try {
+      await api.post('/timeline/bootstrap')
       setBootstrapped(true)
       await fetchEvents()
       await fetchDay(refDate)
-    }
+    } catch { /* ignore */ }
   }, [refDate, fetchDay, fetchEvents])
 
   const generateAI = useCallback(async () => {
     setGenerating(true)
     try {
-      const res = await fetch(`${API}/api/timeline/generate/${refDate}`, { method: 'POST' })
-      if (res.ok) {
-        const data = await res.json()
-        setCtx(prev => prev ? {
-          ...prev,
-          long_commentary: data.long_commentary,
-          medium_commentary: data.medium_commentary,
-          short_commentary: data.short_commentary,
-          has_commentary: true,
-        } : prev)
-      }
-    } finally {
+      const res = await api.post(`/timeline/generate/${refDate}`)
+      const data = res.data
+      setCtx(prev => prev ? {
+        ...prev,
+        long_commentary: data.long_commentary,
+        medium_commentary: data.medium_commentary,
+        short_commentary: data.short_commentary,
+        has_commentary: true,
+      } : prev)
+    } catch { /* ignore */ } finally {
       setGenerating(false)
     }
   }, [refDate])