feat(PROJ-39): eDiscovery Export + Feature-Specs PROJ-40–43

- Neuer POST /api/export/ediscovery Handler (internal/api/ediscovery.go)
- Route in server.go registriert
- Feature-Specs PROJ-39 bis PROJ-43 angelegt
- INDEX.md aktualisiert

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

src/app/search/page.tsx

@@ -3,7 +3,7 @@
 import { useState, useCallback, useEffect, useRef } from "react";
 import { useRouter } from "next/navigation";
 import { useAuth } from "@/hooks/useAuth";
-import { searchEmails, exportMailsZIP, uploadMailFilesUser, getUploadProgressUser, type SearchHit, type UploadJob } from "@/lib/api";
+import { searchEmails, exportMailsZIP, exportEDiscovery, uploadMailFilesUser, getUploadProgressUser, type SearchHit, type UploadJob } from "@/lib/api";
 import { Navbar } from "@/components/navbar";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
@@ -68,6 +68,9 @@ export default function SearchPage() {
   const [exportOpen, setExportOpen] = useState(false);
   const [exportAttachments, setExportAttachments] = useState(false);
   const [exporting, setExporting] = useState(false);
+  const [ediscoveryOpen, setEdiscoveryOpen] = useState(false);
+  const [ediscoveryCaseName, setEdiscoveryCaseName] = useState("");
+  const [ediscoveryLoading, setEdiscoveryLoading] = useState(false);
 
   // Upload state
   const [uploadOpen, setUploadOpen] = useState(false);
@@ -141,6 +144,31 @@ export default function SearchPage() {
     doSearch(1);
   }
 
+  async function handleEDiscoveryExport() {
+    setEdiscoveryLoading(true);
+    try {
+      const { blob, filename } = await exportEDiscovery({
+        case_name: ediscoveryCaseName || undefined,
+        q: query || undefined,
+        from: fromFilter || undefined,
+        to: toFilter || undefined,
+        date_from: dateFrom || undefined,
+        date_to: dateTo || undefined,
+      });
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement("a");
+      a.href = url;
+      a.download = filename;
+      a.click();
+      URL.revokeObjectURL(url);
+      setEdiscoveryOpen(false);
+    } catch (e) {
+      alert(`eDiscovery Export fehlgeschlagen: ${e instanceof Error ? e.message : e}`);
+    } finally {
+      setEdiscoveryLoading(false);
+    }
+  }
+
   async function handleExportZIP() {
     setExporting(true);
     try {
@@ -346,13 +374,18 @@ export default function SearchPage() {
                   : `${total} E-Mail${total !== 1 ? "s" : ""} im Archiv`}
               </div>
 
-              {selected.size > 0 && (
-                <div className="mb-2 flex items-center gap-2">
-                  <span className="text-sm text-muted-foreground">{selected.size} ausgewählt</span>
-                  <Button size="sm" onClick={() => setExportOpen(true)}>Als ZIP exportieren</Button>
-                  <Button size="sm" variant="outline" onClick={() => setSelected(new Set())}>Auswahl aufheben</Button>
-                </div>
-              )}
+              <div className="mb-2 flex items-center gap-2 flex-wrap">
+                {selected.size > 0 && (
+                  <>
+                    <span className="text-sm text-muted-foreground">{selected.size} ausgewählt</span>
+                    <Button size="sm" onClick={() => setExportOpen(true)}>Als ZIP exportieren</Button>
+                    <Button size="sm" variant="outline" onClick={() => setSelected(new Set())}>Auswahl aufheben</Button>
+                  </>
+                )}
+                <Button size="sm" variant="outline" onClick={() => setEdiscoveryOpen(true)}>
+                  eDiscovery Export
+                </Button>
+              </div>
 
               <Card>
                 <Table>
@@ -485,6 +518,49 @@ export default function SearchPage() {
             </DialogFooter>
           </DialogContent>
         </Dialog>
+        {/* eDiscovery Export Dialog */}
+        <Dialog open={ediscoveryOpen} onOpenChange={setEdiscoveryOpen}>
+          <DialogContent>
+            <DialogHeader>
+              <DialogTitle>eDiscovery Export</DialogTitle>
+              <DialogDescription>
+                Exportiert alle Mails der aktuellen Suche als ZIP mit Metadaten-CSV und README.
+              </DialogDescription>
+            </DialogHeader>
+            <div className="space-y-4 py-2">
+              <div className="space-y-1.5">
+                <Label htmlFor="case-name">Case-Name (optional)</Label>
+                <input
+                  id="case-name"
+                  className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-sm placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
+                  placeholder="z.B. Ermittlung-2026-Q1"
+                  value={ediscoveryCaseName}
+                  onChange={(e) => setEdiscoveryCaseName(e.target.value)}
+                />
+              </div>
+              <div className="rounded-md bg-muted px-3 py-2 text-sm text-muted-foreground space-y-1">
+                <div><span className="font-medium">Aktive Filter:</span></div>
+                {query && <div>Suche: <span className="font-mono">{query}</span></div>}
+                {fromFilter && <div>Von: <span className="font-mono">{fromFilter}</span></div>}
+                {toFilter && <div>An: <span className="font-mono">{toFilter}</span></div>}
+                {dateFrom && <div>Von Datum: {dateFrom}</div>}
+                {dateTo && <div>Bis Datum: {dateTo}</div>}
+                {!query && !fromFilter && !toFilter && !dateFrom && !dateTo && (
+                  <div className="italic">Keine Filter — alle archivierten Mails werden exportiert</div>
+                )}
+              </div>
+            </div>
+            <DialogFooter>
+              <Button variant="outline" onClick={() => setEdiscoveryOpen(false)}>
+                Abbrechen
+              </Button>
+              <Button onClick={handleEDiscoveryExport} disabled={ediscoveryLoading}>
+                {ediscoveryLoading ? "Wird exportiert..." : "ZIP herunterladen"}
+              </Button>
+            </DialogFooter>
+          </DialogContent>
+        </Dialog>
+
         {/* Upload Dialog */}
         <Dialog open={uploadOpen} onOpenChange={(open) => { if (!open) handleUploadClose(); else setUploadOpen(true); }}>
           <DialogContent>

src/lib/api/mail.ts

@@ -301,6 +301,29 @@ export async function getPop3Progress(id: number): Promise<Pop3Account> {
   return request<Pop3Account>(`/api/pop3/${id}/progress`);
 }
 
+// ── eDiscovery Export ─────────────────────────────────────────────────────────
+
+export async function exportEDiscovery(params: {
+  case_name?: string;
+  q?: string;
+  from?: string;
+  to?: string;
+  date_from?: string;
+  date_to?: string;
+  has_attachment?: boolean;
+}): Promise<{ blob: Blob; filename: string }> {
+  const res = await fetch(`${API_BASE}/api/export/ediscovery`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    credentials: "include",
+    body: JSON.stringify(params),
+  });
+  if (!res.ok) throw new Error(`eDiscovery Export fehlgeschlagen: ${res.status}`);
+  const cd = res.headers.get("Content-Disposition") || "";
+  const filename = cd.match(/filename="([^"]+)"/)?.[1] || "archivmail-export.zip";
+  return { blob: await res.blob(), filename };
+}
+
 // ── Thread ────────────────────────────────────────────────────────────────────
 
 export async function getThread(threadID: string): Promise<ThreadResponse> {