feat(frontend): rename route to /korrespondenz, update i18n, regen API types

Moves conversations/ to korrespondenz/, updates all internal links,
renames nav label and page heading to Korrespondenz across de/en/es,
and adds all new i18n keys for the redesigned strip and log.

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

frontend/src/lib/generated/api.ts

@@ -724,6 +724,22 @@ export interface paths {
         patch?: never;
         trace?: never;
     };
+    "/api/auth/reset-token-for-test": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get: operations["getResetTokenForTest"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
     "/api/admin/import-status": {
         parameters: {
             query?: never;
@@ -1030,8 +1046,6 @@ export interface components {
             /** Format: int32 */
             totalPages?: number;
             pageable?: components["schemas"]["PageableObject"];
-            first?: boolean;
-            last?: boolean;
             /** Format: int32 */
             size?: number;
             content?: components["schemas"]["NotificationDTO"][];
@@ -1040,14 +1054,16 @@ export interface components {
             sort?: components["schemas"]["SortObject"];
             /** Format: int32 */
             numberOfElements?: number;
+            first?: boolean;
+            last?: boolean;
             empty?: boolean;
         };
         PageableObject: {
-            paged?: boolean;
             /** Format: int32 */
             pageNumber?: number;
             /** Format: int32 */
             pageSize?: number;
+            paged?: boolean;
             /** Format: int64 */
             offset?: number;
             sort?: components["schemas"]["SortObject"];
@@ -2223,7 +2239,9 @@ export interface operations {
             query?: {
                 page?: number;
                 size?: number;
+                /** @description Filter by notification type */
                 type?: "REPLY" | "MENTION";
+                /** @description Filter by read status */
                 read?: boolean;
             };
             header?: never;
@@ -2474,7 +2492,7 @@ export interface operations {
         parameters: {
             query: {
                 senderId: string;
-                receiverId: string;
+                receiverId?: string;
                 from?: string;
                 to?: string;
                 dir?: string;
@@ -2496,6 +2514,28 @@ export interface operations {
             };
         };
     };
+    getResetTokenForTest: {
+        parameters: {
+            query: {
+                email: string;
+            };
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "*/*": string;
+                };
+            };
+        };
+    };
     importStatus: {
         parameters: {
             query?: never;