Fix: Freunde-Aktivitäten öffnen direkt das Ziel-Item

- friends.py: entry_id für diary + walk Einträge zurückgeben
- diary.js: openDetail(id) öffentlich gemacht
- friends.js: App.callModule('diary','openDetail',id) bzw.
  App.callModule('walks','openDetail',id) statt nur App.navigate(page)

backend/routes/friends.py

@@ -224,6 +224,7 @@ async def get_activity(user=Depends(get_current_user)):
         diary_rows = conn.execute(f"""
             SELECT
                 'diary'          AS type,
+                dg.id            AS entry_id,
                 u.id             AS user_id,
                 u.name           AS user_name,
                 u.avatar_url,
@@ -261,6 +262,7 @@ async def get_activity(user=Depends(get_current_user)):
         walk_rows = conn.execute(f"""
             SELECT
                 'walk'           AS type,
+                w.id             AS entry_id,
                 u.id             AS user_id,
                 u.name           AS user_name,
                 u.avatar_url,
@@ -310,6 +312,7 @@ async def get_activity(user=Depends(get_current_user)):
         t = d["type"]
         items.append({
             "type":       t,
+            "entry_id":   d.get("entry_id"),
             "user_id":    d["user_id"],
             "user_name":  d["user_name"],
             "avatar_url": d.get("avatar_url"),