fix(pricing): refresh catalog pricing snapshot

Verify display pricing against the official pricing page and the live
provider model list:

- add claude-fable-5-1 and deepseek/deepseek-v4-flash-fast
- remove minimax/minimax-m3-free and minimax/minimax-m2.7-free, which the
  provider no longer lists
- end the claude-sonnet-5 introductory window; the listed rate is unchanged
- google/gemini-3.7-flash returns to list price after the promotion ended

tests/fixtures/commandcode-model-ids.json

@@ -1,9 +1,10 @@
 {
-  "fetchedAt": "2026-08-28T09:27:52.554Z",
+  "fetchedAt": "2026-09-01T21:28:23.974Z",
   "source": "https://api.commandcode.ai/provider/v1/models",
   "modelIds": [
     "claude-sonnet-5",
     "claude-sonnet-4-6",
+    "claude-fable-5-1",
     "claude-fable-5",
     "claude-opus-5",
     "claude-opus-4-8",
@@ -19,6 +20,7 @@
     "deepseek/deepseek-v4-pro",
     "deepseek/deepseek-v4-flash",
     "deepseek/deepseek-v4-flash-vision-exp",
+    "deepseek/deepseek-v4-flash-fast",
     "moonshotai/Kimi-K3",
     "moonshotai/Kimi-K2.7-Code",
     "moonshotai/Kimi-K2.7-Code-Highspeed",
@@ -32,8 +34,6 @@
     "zai-org/GLM-5",
     "MiniMaxAI/MiniMax-M3",
     "MiniMaxAI/MiniMax-M2.7",
-    "minimax/minimax-m3-free",
-    "minimax/minimax-m2.7-free",
     "MiniMaxAI/MiniMax-M2.5",
     "xiaomi/mimo-v2.5-pro",
     "xiaomi/mimo-v2.5",