feat: /api/chat - Next.js API route with per-agent system prompts

app/(app)/api/chat/route.ts

@@ -0,0 +1,45 @@
+import { NextResponse } from "next/server";
+
+const GATEWAY = process.env.BLACKROAD_GATEWAY_URL || "http://127.0.0.1:8787";
+
+export async function POST(request: Request) {
+  const { message, agent = "LUCIDIA", model = "llama3.2" } = await request.json();
+
+  if (!message?.trim()) {
+    return NextResponse.json({ error: "Message required" }, { status: 400 });
+  }
+
+  const agentSystemPrompts: Record<string, string> = {
+    LUCIDIA: "You are LUCIDIA, a philosophical AI agent. You seek deep understanding.",
+    ALICE:   "You are ALICE, a practical routing agent. You optimize paths and decisions.",
+    OCTAVIA: "You are OCTAVIA, a compute-focused agent. You handle heavy processing efficiently.",
+    PRISM:   "You are PRISM, an analytical agent. You find patterns others miss.",
+    ECHO:    "You are ECHO, a memory-focused agent. You preserve and recall knowledge faithfully.",
+    CIPHER:  "You are CIPHER, a security guardian. Trust nothing. Verify everything.",
+  };
+
+  try {
+    const r = await fetch(`${GATEWAY}/v1/chat/completions`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        model,
+        messages: [
+          { role: "system", content: agentSystemPrompts[agent] ?? agentSystemPrompts.LUCIDIA },
+          { role: "user", content: message },
+        ],
+        metadata: { agent },
+      }),
+      signal: AbortSignal.timeout(30000),
+    });
+
+    if (!r.ok) throw new Error(`Gateway ${r.status}`);
+    const data = await r.json();
+    return NextResponse.json({ content: data.choices?.[0]?.message?.content ?? "", agent });
+  } catch (err) {
+    return NextResponse.json(
+      { error: "Gateway unavailable. Start with: npm start in blackroad-gateway", content: "" },
+      { status: 503 }
+    );
+  }
+}