Update watch face: modular refactor + OWM/Solar/background + codegen tools

- Split render into FieldTable/Fields/Icons/Layout/Settings modules
- Add Fenix8V3Background, Owm (weather), Solar modules
- Add tools/ generators (gen_fields/gen_icons/gen_themes/gen_preview_svg)
- Tune README/manifest/strings/settings

source/FieldTable.mc

@@ -1,18 +1,25 @@
-// AUTO-GENERATED by tools/gen_fields.py -- do not edit by hand.
-// Ids follow https://watchface.io/docs/datafields; only the fields a
-// Connect IQ watch face can source on-device are listed.
+// ⚠️ 本文件由 tools/gen_fields.py 自动生成，请勿手改。
+// 要加字段：在生成器的 FIELDS 表里加一行，跑一遍生成器，
+// 再到 source/Fields.mc 对应分类的函数里补一个分支。
+//
+// 字段编号沿用 https://watchface.io/docs/datafields，只收录 Connect IQ
+// 表盘在本机能算出来的那些。
 import Toybox.Lang;
 
 module FieldTable {
 
-    // Field ids, in the same order as the Labels resource string.
+    // 全部字段 id，顺序与 FieldLabels 资源串（逗号分隔的标签表）严格一致 ——
+    // Fields.label() 就是靠这个下标去取对应标签的。
     const IDS = [
-        0,860,880,864,865,851,872,852,855,870,856,853,868,858,859,873,1,14,707,2,603,150,
-        152,154,151,3,4,5,6,9,10,618,276,12,635,11,623,8,15,281,742,13,278,277,250,251,257,
-        253,255,254,256,252,615,616,733,712,717,700,731,706,732,306,639,300,301,302,305,304,
-        308,307,310,309,703,704,705
+        0,860,880,864,865,851,872,852,855,870,856,853,868,858,859,850,869,873,1,14,707,2,
+        603,150,152,154,151,3,4,5,6,9,10,219,220,211,212,213,214,203,204,200,618,276,12,635,
+        11,623,8,15,281,742,13,278,277,250,251,257,253,255,254,256,252,615,616,733,712,717,
+        700,731,706,732,710,709,708,711,714,715,718,719,720,721,306,639,300,301,302,305,304,
+        308,307,310,309,312,313,314,315,500,515,503,504,505,507,502,501,506,509,510,511,518,
+        512,513,532,536,537,530,534,522,535,523,516,517,703,704,705
     ];
 
+    // 由字段 id 反查它在 IDS 里的下标；找不到返回 0（对应「关闭」）。
     function indexOf(id as Number) as Number {
         for (var i = 0; i < IDS.size(); i++) {
             if (IDS[i] == id) { return i; }