feat: Complete Spanish, French, Portuguese, Chinese localization and add German/Italian support

- Updated all Spanish (es) translation files with comprehensive translations for tracking, AI, family, insights, children, and settings pages
- Updated French (fr), Portuguese (pt), and Chinese (zh) translations to match English structure
- Added German (de) and Italian (it) language support with complete translation files
- Fixed medicine tracker route from /track/medication to /track/medicine
- Updated i18n config to support 7 languages: en, es, fr, pt, zh, de, it
- All tracking pages now fully localized: sleep, feeding, diaper, medicine, activity
- AI assistant interface fully translated with thinking messages and suggested questions
- Family management and insights pages now support all languages

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

maternal-web/locales/zh/insights.json

@@ -0,0 +1,73 @@
+{
+  "title": "洞察与分析",
+  "subtitle": "跟踪模式并获取关于您孩子活动的洞察",
+  "filters": {
+    "child": "孩子",
+    "dateRange": {
+      "7days": "7天",
+      "30days": "30天",
+      "3months": "3个月"
+    }
+  },
+  "stats": {
+    "feedings": {
+      "title": "喂养",
+      "subtitle": "总次数"
+    },
+    "sleep": {
+      "title": "睡眠",
+      "subtitle": "每日平均"
+    },
+    "diapers": {
+      "title": "尿布",
+      "subtitle": "总更换次数"
+    },
+    "topActivity": {
+      "title": "主要活动",
+      "subtitle": "最频繁"
+    }
+  },
+  "charts": {
+    "feedingFrequency": "喂养频率",
+    "sleepDuration": "睡眠时长（小时）",
+    "diaperChangesByType": "按类型分类的尿布更换",
+    "activityTimeline": "活动时间线",
+    "activityDistribution": "活动分布",
+    "chartLabels": {
+      "feedings": "喂养",
+      "diapers": "尿布",
+      "sleepHours": "睡眠（小时）"
+    }
+  },
+  "recentActivities": {
+    "title": "最近活动（最近20次）"
+  },
+  "emptyStates": {
+    "noChildren": {
+      "title": "未添加孩子",
+      "message": "添加孩子以查看洞察和分析",
+      "action": "添加孩子"
+    },
+    "noActivities": "在选定的日期范围内未找到活动。开始跟踪活动以查看洞察！"
+  },
+  "errors": {
+    "loadChildren": "加载孩子信息失败",
+    "loadActivities": "加载活动失败"
+  },
+  "activityTypes": {
+    "feeding": "喂养",
+    "sleep": "睡眠",
+    "diaper": "尿布",
+    "medication": "药物",
+    "milestone": "里程碑",
+    "note": "备注",
+    "none": "无"
+  },
+  "diaperTypes": {
+    "wet": "湿",
+    "dirty": "脏",
+    "both": "两者",
+    "dry": "干",
+    "unknown": "未知"
+  }
+}