feat: add ahoy dashboard and city statistics

- Introduce a new admin dashboard for viewing Ahoy statistics.
- Display total visits, event counts, and unique visitors.
- List most popular and least popular active cities with their visit counts.
- Add a panel for recent events.
- Modify existing dashboard to include a section for inactive cities.

This commit introduces a comprehensive dashboard that helps
admin users monitor the traffic and engagement statistics of
various cities. The changes include functionality to show
active and inactive cities based on their popularity,
allowing for better insights into user engagement across
the application.

app/admin/ahoy_dashboard.rb

@@ -0,0 +1,66 @@
+ActiveAdmin.register_page "Ahoy Dashboard" do
+  menu label: "总览", parent: "数据统计", priority: 1
+
+  content title: "总览" do
+    columns do
+      column do
+        panel "访问统计" do
+          para "总访问量: #{Ahoy::Visit.count}"
+          para "总事件数: #{Ahoy::Event.count}"
+          para "独立访客数: #{Ahoy::Visit.distinct.count(:visitor_token)}"
+        end
+      end
+
+      column do
+        panel "热门城市" do
+          table_for City.by_popularity.limit(10) do
+            column("城市") { |city| link_to(city.name, admin_city_path(city)) }
+            column("访问量") { |city| city.view_count }
+          end
+        end
+      end
+
+      column do
+        panel "热门天气艺术" do
+          table_for WeatherArt.by_popularity.limit(10) do
+            column("作品") { |art| link_to(art.to_s, admin_weather_art_path(art)) }
+            column("访问量") { |art| art.view_count }
+          end
+        end
+      end
+    end
+
+    columns do
+      column do
+        panel "最冷门活跃城市" do
+          table_for City.least_popular_active.limit(10) do
+            column("城市") { |city| link_to(city.name, admin_city_path(city)) }
+            column("访问量") { |city| city.view_count }
+            # column("状态") { |city| status_tag(city.active? ? "活跃" : "停用") }
+          end
+        end
+      end
+
+      column do
+        panel "热门未活跃城市" do
+          table_for City.most_popular_inactive.limit(10) do
+            column("城市") { |city| link_to(city.name, admin_city_path(city)) }
+            column("访问量") { |city| city.view_count }
+            column("状态") { |city| status_tag(city.active? ? "活跃" : "停用") }
+            column("所属区域") { |city| city.country.region.name }
+          end
+        end
+      end
+    end
+
+    # 添加一个事件列表面板
+    panel "最近事件" do
+      table_for Ahoy::Event.order(time: :desc).limit(10) do
+        column :time
+        column :name
+        column :properties
+      end
+    end
+
+  end
+end

app/admin/dashboard.rb

@@ -37,9 +37,11 @@ ActiveAdmin.register_page "Dashboard" do
           end
         end
       end
+    end
 
+    columns do
       column do
-        panel "冷门活跃城市" do
+        panel "最冷门活跃城市" do
           table_for City.least_popular_active.limit(10) do
             column("城市") { |city| link_to(city.name, admin_city_path(city)) }
             column("访问量") { |city| city.view_count }
@@ -47,6 +49,17 @@ ActiveAdmin.register_page "Dashboard" do
           end
         end
       end
+
+      column do
+        panel "热门未活跃城市" do
+          table_for City.most_popular_inactive.limit(10) do
+            column("城市") { |city| link_to(city.name, admin_city_path(city)) }
+            column("访问量") { |city| city.view_count }
+            column("状态") { |city| status_tag(city.active? ? "活跃" : "停用") }
+            column("所属区域") { |city| city.country.region.name }
+          end
+        end
+      end
     end
 
     # 添加一个事件列表面板

app/models/city.rb

@@ -53,6 +53,24 @@ class City < ApplicationRecord
         .order("visit_count ASC, cities.name ASC")
     end
   }
+  scope :most_popular_inactive, -> {
+    if ActiveRecord::Base.connection.adapter_name.downcase == 'sqlite'
+      where(active: false)
+        .joins("LEFT JOIN ahoy_events ON json_extract(ahoy_events.properties, '$.city_id') = cities.id
+               AND json_extract(ahoy_events.properties, '$.event_type') = 'city_view'")
+        .group("cities.id")
+        .select("cities.*, COUNT(ahoy_events.id) as visit_count")
+        .order("COUNT(ahoy_events.id) DESC, cities.name ASC")
+    else
+      where(active: false)
+        .joins("LEFT JOIN ahoy_events ON (ahoy_events.properties::jsonb->>'city_id')::integer = cities.id
+               AND ahoy_events.properties::jsonb->>'event_type' = 'city_view'")
+        .group("cities.id")
+        .select("cities.*, COUNT(ahoy_events.id) as visit_count")
+        .order("COUNT(ahoy_events.id) DESC, cities.name ASC")
+    end
+  }
+
 
   def to_s
     name