fix(pricing): price deepseek-v4.1-flash as V4.1 Flash

Third-party upstreams such as OpenCode Go, OpenRouter (deepseek/
namespace) and the Hermes presets call DeepSeek V4.1 Flash
deepseek-v4.1-flash. Pricing had no row for that id: none of the lookup
fallbacks turn it into deepseek-flash, and the prefix fallback only
matches longer ids. These requests showed "Unpriced" and were counted
at $0.

Add a deepseek-v4.1-flash row at the same official peak price as
deepseek-flash (0.3 / 1.2 / 0.006 per million). Default prices are added
again on every start, so existing installs get the row on next launch.
Requests already logged are not repriced.

src-tauri/src/database/schema.rs

@@ -2393,6 +2393,17 @@ impl Database {
                 "0.006",
                 "0",
             ),
+            // 第三方上游（OpenCode Go、OpenRouter 的 deepseek/ 命名空间、Hermes 预设等）用带版本号的
+            // deepseek-v4.1-flash。点号版本既剥不成 deepseek-flash，前缀兜底也只命中更长的行，
+            // 不单列会显示「未定价」并按 0 计费
+            (
+                "deepseek-v4.1-flash",
+                "DeepSeek V4.1 Flash",
+                "0.3",
+                "1.2",
+                "0.006",
+                "0",
+            ),
             (
                 "deepseek-v4-flash",
                 "DeepSeek V4 Flash",

src-tauri/src/database/tests.rs

@@ -1040,6 +1040,7 @@ fn model_pricing_seed_covers_deepseek_v41_flash_aliases() {
     // 查价前缀兜底是 LIKE '{id}-%'，只命中更长的行，任一行缺失都会静默按 0 计费。
     for model_id in [
         "deepseek-flash",
+        "deepseek-v4.1-flash",
         "deepseek-v4-flash",
         "deepseek-v4-flash-0731",
         "deepseek-v4-flash-vision-exp",