feat(compat): per-protocol model compatibility config (V5)

Add per-protocol compatibility options (compatByProtocol) allowing users to configure normalizeToolCallId and preserveOpenAIDeveloperRole per client request protocol (OpenAI Chat, Responses API, Anthropic Messages) instead of globally. Includes frontend Map lookup optimization, type safety improvements, and client-safe constant extraction.

Made-with: Cursor

src/shared/validation/schemas.ts

@@ -340,6 +340,13 @@ export const clearModelAvailabilitySchema = z.object({
   model: modelIdSchema,
 });
 
+const modelCompatPerProtocolSchema = z
+  .object({
+    normalizeToolCallId: z.boolean().optional(),
+    preserveOpenAIDeveloperRole: z.boolean().optional(),
+  })
+  .strict();
+
 export const providerModelMutationSchema = z.object({
   provider: z.string().trim().min(1, "provider is required").max(120),
   modelId: z.string().trim().min(1, "modelId is required").max(240),
@@ -349,6 +356,9 @@ export const providerModelMutationSchema = z.object({
   supportedEndpoints: z.array(z.enum(["chat", "embeddings", "images", "audio"])).default(["chat"]),
   normalizeToolCallId: z.boolean().optional(),
   preserveOpenAIDeveloperRole: z.boolean().nullable().optional(),
+  compatByProtocol: z
+    .record(z.enum(["openai", "openai-responses", "claude"]), modelCompatPerProtocolSchema)
+    .optional(),
 });
 
 const pricingFieldsSchema = z