fix: add DeepSeek to non-standard providers (fixes developer role issue)

DeepSeek API does not support the `developer` role, only `system`.
This patch adds DeepSeek to the list of non-standard providers in
@mariozechner/pi-ai so that it uses `system` role instead.

Fixes #3566

package.json

@@ -245,6 +245,9 @@
     "tar": "7.5.4"
   },
   "pnpm": {
+    "patchedDependencies": {
+      "@mariozechner/pi-ai@0.49.3": "patches/@mariozechner__pi-ai@0.49.3.patch"
+    },
     "minimumReleaseAge": 2880,
     "overrides": {
       "@sinclair/typebox": "0.34.47",

patches/@mariozechner__pi-ai@0.49.3.patch

@@ -0,0 +1,12 @@
+diff --git a/dist/providers/openai-completions.js b/dist/providers/openai-completions.js
+--- a/dist/providers/openai-completions.js
++++ b/dist/providers/openai-completions.js
+@@ -624,6 +624,8 @@ function detectCompat(model) {
+         baseUrl.includes("chutes.ai") ||
+         isZai ||
+         provider === "opencode" ||
++        provider === "deepseek" ||
++        baseUrl.includes("api.deepseek.com") ||
+         baseUrl.includes("opencode.ai");
+     const useMaxTokens = provider === "mistral" || baseUrl.includes("mistral.ai") || baseUrl.includes("chutes.ai");
+     const isGrok = provider === "xai" || baseUrl.includes("api.x.ai");