chore: migrate remaining ECharts components to Chart.js

- Migrated 4 components from ECharts to Chart.js:
  * MonthlyExpenseCard.vue (折线图)
  * DailyTrendChart.vue (双系列折线图)
  * ExpenseCategoryCard.vue (环形图)
  * BudgetChartAnalysis.vue (仪表盘 + 多种图表)

- Removed all ECharts imports and environment variable switches
- Unified all charts to use BaseChart.vue component
- Build verified: pnpm build success ✓
- No echarts imports remaining ✓

Refs: openspec/changes/migrate-remaining-echarts-to-chartjs

Web/pnpm-lock.yaml

@@ -8,15 +8,18 @@ importers:
 
   .:
     dependencies:
+      '@iconify/iconify':
+        specifier: ^3.1.1
+        version: 3.1.1
       axios:
         specifier: ^1.13.2
         version: 1.13.2
+      chart.js:
+        specifier: ^4.5.1
+        version: 4.5.1
       dayjs:
         specifier: ^1.11.19
         version: 1.11.19
-      echarts:
-        specifier: ^6.0.0
-        version: 6.0.0
       pinia:
         specifier: ^3.0.4
         version: 3.0.4(vue@3.5.26)
@@ -26,6 +29,9 @@ importers:
       vue:
         specifier: ^3.5.25
         version: 3.5.26
+      vue-chartjs:
+        specifier: ^5.3.3
+        version: 5.3.3(chart.js@4.5.1)(vue@3.5.26)
       vue-router:
         specifier: ^4.6.3
         version: 4.6.4(vue@3.5.26)
@@ -416,6 +422,13 @@ packages:
     resolution: {integrity: sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ==}
     engines: {node: '>=18.18'}
 
+  '@iconify/iconify@3.1.1':
+    resolution: {integrity: sha512-1nemfyD/OJzh9ALepH7YfuuP8BdEB24Skhd8DXWh0hzcOxImbb1ZizSZkpCzAwSZSGcJFmscIBaBQu+yLyWaxQ==}
+    deprecated: no longer maintained, switch to modern iconify-icon web component
+
+  '@iconify/types@2.0.0':
+    resolution: {integrity: sha512-+wluvCrRhXrhyOmRDJ3q8mux9JkKy5SJ/v8ol2tu4FVjyYvtEzkc/3pK15ET6RKg4b4w4BmTk1+gsCUhf21Ykg==}
+
   '@jridgewell/gen-mapping@0.3.13':
     resolution: {integrity: sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==}
 
@@ -432,6 +445,9 @@ packages:
   '@jridgewell/trace-mapping@0.3.31':
     resolution: {integrity: sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==}
 
+  '@kurkle/color@0.3.4':
+    resolution: {integrity: sha512-M5UknZPHRu3DEDWoipU6sE8PdkZ6Z/S+v4dD+Ke8IaNlpdSQah50lz1KtcFBa2vsdOnwbbnxJwVM4wty6udA5w==}
+
   '@parcel/watcher-android-arm64@2.5.6':
     resolution: {integrity: sha512-YQxSS34tPF/6ZG7r/Ih9xy+kP/WwediEUsqmtf0cuCV5TPPKw/PQHRhueUo6JdeFJaqV3pyjm0GdYjZotbRt/A==}
     engines: {node: '>= 10.0.0'}
@@ -799,6 +815,10 @@ packages:
     resolution: {integrity: sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==}
     engines: {node: '>=10'}
 
+  chart.js@4.5.1:
+    resolution: {integrity: sha512-GIjfiT9dbmHRiYi6Nl2yFCq7kkwdkp1W/lp2J99rX0yo9tgJGn3lKQATztIjb5tVtevcBtIdICNWqlq5+E8/Pw==}
+    engines: {pnpm: '>=8'}
+
   chokidar@4.0.3:
     resolution: {integrity: sha512-Qgzu8kfBvo+cA4962jnP1KkS6Dop5NS6g7R5LFYJr4b8Ub94PPQXUksCw9PvXoeXPRRddRNC5C1JQUR2SMGtnA==}
     engines: {node: '>= 14.16.0'}
@@ -878,9 +898,6 @@ packages:
     resolution: {integrity: sha512-KIN/nDJBQRcXw0MLVhZE9iQHmG68qAVIBg9CqmUYjmQIhgij9U5MFvrqkUL5FbtyyzZuOeOt0zdeRe4UY7ct+A==}
     engines: {node: '>= 0.4'}
 
-  echarts@6.0.0:
-    resolution: {integrity: sha512-Tte/grDQRiETQP4xz3iZWSvoHrkCQtwqd6hs+mifXcjrCuo2iKWbajFObuLJVBlDIJlOzgQPd1hsaKt/3+OMkQ==}
-
   electron-to-chromium@1.5.267:
     resolution: {integrity: sha512-0Drusm6MVRXSOJpGbaSVgcQsuB4hEkMpHXaVstcPmhu5LIedxs1xNK/nIxmQIU/RPC0+1/o0AVZfBTkTNJOdUw==}
 
@@ -1631,6 +1648,12 @@ packages:
       yaml:
         optional: true
 
+  vue-chartjs@5.3.3:
+    resolution: {integrity: sha512-jqxtL8KZ6YJ5NTv6XzrzLS7osyegOi28UGNZW0h9OkDL7Sh1396ht4Dorh04aKrl2LiSalQ84WtqiG0RIJb0tA==}
+    peerDependencies:
+      chart.js: ^4.1.1
+      vue: ^3.0.0-0 || ^2.7.0
+
   vue-eslint-parser@10.2.0:
     resolution: {integrity: sha512-CydUvFOQKD928UzZhTp4pr2vWz1L+H99t7Pkln2QSPdvmURT0MoC4wUccfCnuEaihNsu9aYYyk+bep8rlfkUXw==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
@@ -1674,9 +1697,6 @@ packages:
     resolution: {integrity: sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==}
     engines: {node: '>=10'}
 
-  zrender@6.0.0:
-    resolution: {integrity: sha512-41dFXEEXuJpNecuUQq6JlbybmnHaqqpGlbH1yxnA5V9MMP4SbohSVZsJIwz+zdjQXSSlR1Vc34EgH1zxyTDvhg==}
-
 snapshots:
 
   '@babel/code-frame@7.27.1':
@@ -2007,6 +2027,12 @@ snapshots:
 
   '@humanwhocodes/retry@0.4.3': {}
 
+  '@iconify/iconify@3.1.1':
+    dependencies:
+      '@iconify/types': 2.0.0
+
+  '@iconify/types@2.0.0': {}
+
   '@jridgewell/gen-mapping@0.3.13':
     dependencies:
       '@jridgewell/sourcemap-codec': 1.5.5
@@ -2026,6 +2052,8 @@ snapshots:
       '@jridgewell/resolve-uri': 3.1.2
       '@jridgewell/sourcemap-codec': 1.5.5
 
+  '@kurkle/color@0.3.4': {}
+
   '@parcel/watcher-android-arm64@2.5.6':
     optional: true
 
@@ -2383,6 +2411,10 @@ snapshots:
       ansi-styles: 4.3.0
       supports-color: 7.2.0
 
+  chart.js@4.5.1:
+    dependencies:
+      '@kurkle/color': 0.3.4
+
   chokidar@4.0.3:
     dependencies:
       readdirp: 4.1.2
@@ -2446,11 +2478,6 @@ snapshots:
       es-errors: 1.3.0
       gopd: 1.2.0
 
-  echarts@6.0.0:
-    dependencies:
-      tslib: 2.3.0
-      zrender: 6.0.0
-
   electron-to-chromium@1.5.267: {}
 
   entities@7.0.0: {}
@@ -3148,6 +3175,11 @@ snapshots:
       sass: 1.97.3
       sass-embedded: 1.97.3
 
+  vue-chartjs@5.3.3(chart.js@4.5.1)(vue@3.5.26):
+    dependencies:
+      chart.js: 4.5.1
+      vue: 3.5.26
+
   vue-eslint-parser@10.2.0(eslint@9.39.2):
     dependencies:
       debug: 4.4.3
@@ -3188,7 +3220,3 @@ snapshots:
   yallist@3.1.1: {}
 
   yocto-queue@0.1.0: {}
-
-  zrender@6.0.0:
-    dependencies:
-      tslib: 2.3.0