Promote calendar snapshot to v1.5.5 release

The calendar local-time and AI airport-read fixes are a numbered product release rather than a temporary snapshot, so the changelog and package/version metadata now use 1.5.5 consistently.

Constraint: Existing snapshot tag was already pushed before the numbered release correction

Rejected: Keep snapshot label in changelog | user clarified this should be the 1.5.5 version

Confidence: high

Scope-risk: narrow

Tested: Reviewed git diff for CHANGELOG, VERSION, frontend package metadata

Not-tested: No runtime tests; metadata-only version correction

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## snapshot-2026-04-27-calendar-local-time - 2026-04-27
+## 1.5.5 - 2026-04-27
 
 - 城市决策卡新增 AI 机场报文解读缓存说明：页面内存缓存保留 loading / 流式片段 / 最终结果，`localStorage` 保存最终成功 payload，后端 AI 缓存不再因 `local_time` 变化失效
 - 城市决策卡兜底文案明确为“AI 机场报文解读正常”，不再使用“AI 增强可后补 / 不阻塞”这类容易被误解为 AI 未解读的表述

VERSION

@@ -1 +1 @@
-1.5.4
+1.5.5

frontend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "polyweather-frontend",
-  "version": "1.5.4",
+  "version": "1.5.5",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "polyweather-frontend",
-      "version": "1.5.4",
+      "version": "1.5.5",
       "dependencies": {
         "@radix-ui/react-slot": "^1.1.2",
         "@supabase/ssr": "^0.5.2",

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "polyweather-frontend",
-  "version": "1.5.4",
+  "version": "1.5.5",
   "private": true,
   "scripts": {
     "dev": "node scripts/sync-next-server-chunks.mjs --clean-root && next dev",