fix(presets): use dated Doubao model id and price 6-digit dated models

Volcengine Ark rejects the bare model name doubao-seed-2-1-pro with a 404
("model does not exist or you do not have access to it") even after the
model is activated; the API requires the full dated id
doubao-seed-2-1-pro-260628. Update the Doubao preset model id across all
apps (config default, generated catalog, and OpenClaw namespaced refs).

Pricing lookup only stripped 8-digit (YYYYMMDD) and ISO date suffixes, not
the 6-digit YYMMDD format Volcengine uses (-260628, -250615), so real
Doubao usage never matched the bare-name pricing seed and showed $0 cost.
Extend strip_model_date_suffix to also strip 6-digit YYMMDD (with
month/day validation to avoid eating non-date version suffixes), keeping
the bare-name pricing seed as the canonical identity. This also fixes
pricing for every other Volcengine Doubao model. Add unit and end-to-end
regression tests.

tests/config/codexChatProviderPresets.test.ts

@@ -158,7 +158,10 @@ describe("Codex Chat provider presets", () => {
       string,
       { contextWindows: Record<string, number> }
     >([
-      ["DouBaoSeed", { contextWindows: { "doubao-seed-2-1-pro": 262144 } }],
+      [
+        "DouBaoSeed",
+        { contextWindows: { "doubao-seed-2-1-pro-260628": 262144 } },
+      ],
       ["Bailian", { contextWindows: { "qwen3-coder-plus": 1048576 } }],
       ["Longcat", { contextWindows: { "LongCat-2.0-Preview": 1048576 } }],
       ["MiniMax", { contextWindows: { "MiniMax-M3": 1000000 } }],