feat: implement comprehensive reading analytics system with bot detection

Features:
- Add article view tracking with automatic deduplication (per user/IP)
- Implement intelligent bot detection (35+ patterns: Google, Bing, Baidu, GPTBot, etc)
- Create admin analytics dashboard with statistics and filtering
- Display view count and comment count on article cards
- Add search-based article filter (replaced dropdown for scalability)

Analytics Dashboard:
- Global stats: total views, human/bot views, unique IPs/users
- Top 20 articles ranking with detailed metrics
- Detailed view records with time, article, user, IP, user-agent
- Filters: article title search, IP search, show/hide bots
- Pagination support (50 records per page)

Technical Implementation:
- Async view recording (non-blocking)
- Dual deduplication (application + database layer)
- Database indexes for performance optimization
- Batch query for comment counts
- Full i18n support (Chinese/English)

Files Added:
- models/article_view.go: View tracking model
- models/bot_detector.go: Bot detection logic
- handlers/admin_analytics.go: Analytics page handler
- templates/admin/analytics_views.html: Analytics UI
- test_analytics.sh: Testing script
- Documentation: implementation guide, usage guide, changelog

Files Modified:
- handlers/home.go: Add view recording and comment count queries
- models/db.go: Add ArticleView to auto-migration
- main.go: Add analytics routes
- i18n/i18n.go: Add 35+ translation keys
- templates/admin/dashboard.html: Add analytics entry link
- templates/pages/home.html: Display view/comment counts on cards

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

i18n/i18n.go

@@ -325,6 +325,44 @@ var translations = map[Lang]map[string]string{
 		"user_cannot_disable_self":  "You cannot disable or lock your own account.",
 		"user_cannot_remove_last_admin": "Cannot remove the last administrator.",
 		"dash_user_mgmt":            "Manage Users",
+
+		// Analytics
+		"analytics_views_title":       "Reading Analytics",
+		"analytics_views_desc":        "Track article views, identify unique visitors and detect bots.",
+		"analytics_stats_total":       "Total Views",
+		"analytics_stats_human_views": "Human Views",
+		"analytics_stats_bot_views":   "Bot Views",
+		"analytics_stats_unique_ips":  "Unique IPs",
+		"analytics_stats_unique_users": "Unique Users",
+		"analytics_article_stats":     "Article Statistics (Top 20)",
+		"analytics_col_article":       "Article",
+		"analytics_col_total_views":   "Total Views",
+		"analytics_col_human_views":   "Human",
+		"analytics_col_bot_views":     "Bots",
+		"analytics_col_unique_ips":    "Unique IPs",
+		"analytics_col_time":          "Time",
+		"analytics_col_user":          "User",
+		"analytics_col_ip":            "IP Address",
+		"analytics_col_user_agent":    "User Agent",
+		"analytics_col_is_bot":        "Type",
+		"analytics_filters":           "Filters",
+		"analytics_filter_article":    "Article Title",
+		"analytics_filter_article_placeholder": "Search article title",
+		"analytics_filter_ip":         "IP Address",
+		"analytics_filter_ip_placeholder": "Search by IP",
+		"analytics_filter_show_bots":  "Show Bots",
+		"analytics_include_bots":      "Include bot traffic",
+		"analytics_apply_filters":     "Apply Filters",
+		"analytics_recent_views":      "Recent Views",
+		"analytics_bot":               "Bot",
+		"analytics_human":             "Human",
+		"analytics_anonymous":         "Anonymous",
+		"analytics_article_deleted":   "(Deleted)",
+		"analytics_no_data":           "No data available.",
+		"analytics_no_views":          "No view records found.",
+		"analytics_showing":           "Showing",
+		"analytics_of":                "of",
+		"analytics_load_more":         "Load More",
 	},
 	ZH: {
 		// 导航
@@ -635,6 +673,44 @@ var translations = map[Lang]map[string]string{
 		"user_cannot_disable_self":  "不能禁用或锁定自己的账号。",
 		"user_cannot_remove_last_admin": "不能移除最后一个管理员。",
 		"dash_user_mgmt":            "用户管理",
+
+		// 阅读统计
+		"analytics_views_title":       "阅读统计",
+		"analytics_views_desc":        "追踪文章阅读量，识别独立访客和爬虫。",
+		"analytics_stats_total":       "总阅读量",
+		"analytics_stats_human_views": "真人阅读",
+		"analytics_stats_bot_views":   "爬虫访问",
+		"analytics_stats_unique_ips":  "独立IP",
+		"analytics_stats_unique_users": "独立用户",
+		"analytics_article_stats":     "文章统计（前20篇）",
+		"analytics_col_article":       "文章",
+		"analytics_col_total_views":   "总阅读量",
+		"analytics_col_human_views":   "真人",
+		"analytics_col_bot_views":     "爬虫",
+		"analytics_col_unique_ips":    "独立IP",
+		"analytics_col_time":          "时间",
+		"analytics_col_user":          "用户",
+		"analytics_col_ip":            "IP地址",
+		"analytics_col_user_agent":    "User Agent",
+		"analytics_col_is_bot":        "类型",
+		"analytics_filters":           "筛选条件",
+		"analytics_filter_article":    "文章标题",
+		"analytics_filter_article_placeholder": "搜索文章标题",
+		"analytics_filter_ip":         "IP地址",
+		"analytics_filter_ip_placeholder": "按IP搜索",
+		"analytics_filter_show_bots":  "显示爬虫",
+		"analytics_include_bots":      "包含爬虫流量",
+		"analytics_apply_filters":     "应用筛选",
+		"analytics_recent_views":      "最近访问记录",
+		"analytics_bot":               "爬虫",
+		"analytics_human":             "真人",
+		"analytics_anonymous":         "匿名用户",
+		"analytics_article_deleted":   "（已删除）",
+		"analytics_no_data":           "暂无数据。",
+		"analytics_no_views":          "未找到访问记录。",
+		"analytics_showing":           "显示",
+		"analytics_of":                "共",
+		"analytics_load_more":         "加载更多",
 	},
 }