Add debug endpoint to verify Discord bot and web app Supabase connection

Creates a new API endpoint at `/api/discord/debug-verify` to help diagnose Supabase connection issues between the Discord bot and the web application by checking environment variables and querying verification and link data.

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api/discord/debug-verify.ts

@@ -0,0 +1,71 @@
+import { createClient } from "@supabase/supabase-js";
+
+export const config = {
+  runtime: "nodejs",
+};
+
+export default async function handler(req: any, res: any) {
+  const supabaseUrl = process.env.SUPABASE_URL || process.env.VITE_SUPABASE_URL;
+  const supabaseServiceRole = process.env.SUPABASE_SERVICE_ROLE;
+
+  const debug: any = {
+    timestamp: new Date().toISOString(),
+    env: {
+      hasSupabaseUrl: !!supabaseUrl,
+      supabaseUrlPrefix: supabaseUrl?.substring(0, 30) + "...",
+      hasServiceRole: !!supabaseServiceRole,
+      serviceRolePrefix: supabaseServiceRole?.substring(0, 20) + "...",
+    },
+  };
+
+  if (!supabaseUrl || !supabaseServiceRole) {
+    return res.status(500).json({
+      error: "Missing environment variables",
+      debug,
+    });
+  }
+
+  try {
+    const supabase = createClient(supabaseUrl, supabaseServiceRole);
+
+    const { data: codes, error: codesError } = await supabase
+      .from("discord_verifications")
+      .select("verification_code, discord_id, expires_at, created_at")
+      .order("created_at", { ascending: false })
+      .limit(5);
+
+    debug.verificationCodes = {
+      count: codes?.length || 0,
+      error: codesError?.message,
+      codes: codes?.map((c) => ({
+        code: c.verification_code,
+        discord_id: c.discord_id?.substring(0, 6) + "...",
+        expires_at: c.expires_at,
+        is_expired: new Date(c.expires_at) < new Date(),
+      })),
+    };
+
+    const { data: links, error: linksError } = await supabase
+      .from("discord_links")
+      .select("discord_id, user_id, linked_at")
+      .order("linked_at", { ascending: false })
+      .limit(5);
+
+    debug.discordLinks = {
+      count: links?.length || 0,
+      error: linksError?.message,
+    };
+
+    res.status(200).json({
+      status: "ok",
+      message: "Supabase connection working",
+      debug,
+    });
+  } catch (error: any) {
+    res.status(500).json({
+      error: "Connection failed",
+      message: error?.message,
+      debug,
+    });
+  }
+}