fix(ticketmachine): 修复站点缓存与匹配问题，优化数据处理逻辑

- 配置更新时清空singleSegments缓存，确保UI重新渲染
- 支持stations、stops、站点列表、站点四种站点列表键名
- 为站点与票价代码添加标准化处理，提升跨格式匹配准确性
- 同步更新线路选择渲染的站点列表提取逻辑
- 新增test-db.js测试脚本用于数据服务验证
- 新增空的data.json文件作为数据存储占位

ticketmachine.lua

@@ -963,6 +963,7 @@ local function waitButtons()
         end
       end
     elseif ev == 'config_updated' then
+      singleSegments = nil
       -- If config was updated in background, return to force UI re-render
       return
     end
@@ -1175,13 +1176,20 @@ local function buildSingleSegments()
   local segments = {}
   local fares = CFG.fares or {}
   for _, line in ipairs(CFG.lines or {}) do
-    local stops = line.stops or line['站点列表'] or {}
+    local stops = {}
+    if type(line.stops) == 'table' then stops = line.stops
+    elseif type(line['站点列表']) == 'table' then stops = line['站点列表']
+    elseif type(line.stations) == 'table' then stops = line.stations
+    elseif type(line['站点']) == 'table' then stops = line['站点']
+    end
     local lineFares = {}
     for i = 1, #stops - 1 do
-      local a, b = stops[i], stops[i+1]
+      local a, b = normalizeCode(stops[i]), normalizeCode(stops[i+1])
       local f = nil
       for _, fx in ipairs(fares) do
-        if (fx.from == a and fx.to == b) or (fx.from == b and fx.to == a) then
+        local from = normalizeCode(fx.from)
+        local to = normalizeCode(fx.to)
+        if (from == a and to == b) or (from == b and to == a) then
           f = fx
           break
         end
@@ -1203,10 +1211,10 @@ local function buildSingleSegments()
 end
 
 local function showSingleSegmentSelection()
-  if not singleSegments then
-    singleSegments = buildSingleSegments()
-  end
   while state.page == 'single_segment' do
+    if not singleSegments or #singleSegments == 0 then
+      singleSegments = buildSingleSegments()
+    end
     drawHeader('Select Single Segment', 'Select a line and fare')
     Buttons = {}
     local itemsPerPage = math.floor((h - 10) / 4) * 2
@@ -1566,7 +1574,15 @@ local function renderLinesSelection(title, selectedCode, backPage, nextPage, inf
     local y = startY
     for _, l in ipairs(CFG.lines) do
       y = y + 2; local x = 2
-      for _, sc in ipairs((type(l) == 'table' and type(l.stations) == 'table' and l.stations) or {}) do
+      local stopsList = {}
+      if type(l) == 'table' then
+        if type(l.stations) == 'table' then stopsList = l.stations
+        elseif type(l.stops) == 'table' then stopsList = l.stops
+        elseif type(l['站点列表']) == 'table' then stopsList = l['站点列表']
+        elseif type(l['站点']) == 'table' then stopsList = l['站点']
+        end
+      end
+      for _, sc in ipairs(stopsList) do
         local c = normalizeCode(sc)
         local st = stationByCode[c]
         local label = (st and (st.en_name or st.name)) or c
@@ -1598,7 +1614,15 @@ local function renderLinesSelection(title, selectedCode, backPage, nextPage, inf
       termDev.setBackgroundColor(colors.black)
     end
     y = y + 1; local x = 2
-    for _, sc in ipairs((type(l) == 'table' and type(l.stations) == 'table' and l.stations) or {}) do
+    local stopsList = {}
+    if type(l) == 'table' then
+      if type(l.stations) == 'table' then stopsList = l.stations
+      elseif type(l.stops) == 'table' then stopsList = l.stops
+      elseif type(l['站点列表']) == 'table' then stopsList = l['站点列表']
+      elseif type(l['站点']) == 'table' then stopsList = l['站点']
+      end
+    end
+    for _, sc in ipairs(stopsList) do
       local c = normalizeCode(sc)
       local st = stationByCode[c]
       local label = (st and (st.en_name or st.name)) or c