feat: integrate real data into dashboard

- Created dashboard service with DB queries for users, economy, events
- Added client stats provider with 30s caching for Discord metrics
- Implemented /api/stats endpoint aggregating all dashboard data
- Created useDashboardStats React hook with auto-refresh
- Updated Dashboard.tsx to display real data with loading/error states
- Added comprehensive test coverage (11 tests passing)
- Replaced all mock values with live Discord and database metrics

shared/modules/dashboard/dashboard.service.test.ts

@@ -0,0 +1,153 @@
+import { describe, test, expect, mock, beforeEach } from "bun:test";
+import { dashboardService } from "./dashboard.service";
+
+// Mock DrizzleClient
+const mockSelect = mock(() => ({
+    from: mock(() => Promise.resolve([{ count: "5" }])),
+}));
+
+const mockQuery = {
+    transactions: {
+        findMany: mock(() => Promise.resolve([])),
+    },
+    moderationCases: {
+        findMany: mock(() => Promise.resolve([])),
+    },
+};
+
+mock.module("@shared/db/DrizzleClient", () => ({
+    DrizzleClient: {
+        select: mockSelect,
+        query: mockQuery,
+    },
+}));
+
+describe("dashboardService", () => {
+    beforeEach(() => {
+        mockSelect.mockClear();
+        mockQuery.transactions.findMany.mockClear();
+        mockQuery.moderationCases.findMany.mockClear();
+
+        // Reset default mock implementation
+        mockSelect.mockImplementation(() => ({
+            from: mock(() => Promise.resolve([{ count: "5" }])),
+        }));
+    });
+
+    describe("getActiveUserCount", () => {
+        test("should return active user count from database", async () => {
+            mockSelect.mockImplementationOnce(() => ({
+                from: mock(() => ({
+                    where: mock(() => Promise.resolve([{ count: "5" }])),
+                })),
+            }));
+
+            const count = await dashboardService.getActiveUserCount();
+            expect(count).toBe(5);
+            expect(mockSelect).toHaveBeenCalled();
+        });
+
+        test("should return 0 when no users found", async () => {
+            mockSelect.mockImplementationOnce(() => ({
+                from: mock(() => ({
+                    where: mock(() => Promise.resolve([{ count: "0" }])),
+                })),
+            }));
+
+            const count = await dashboardService.getActiveUserCount();
+            expect(count).toBe(0);
+        });
+    });
+
+    describe("getTotalUserCount", () => {
+        test("should return total user count", async () => {
+            const count = await dashboardService.getTotalUserCount();
+            expect(count).toBe(5);
+        });
+    });
+
+    describe("getRecentTransactions", () => {
+        test("should return formatted transaction events", async () => {
+            const mockTx = [
+                {
+                    type: "DAILY_REWARD",
+                    description: "Daily reward",
+                    createdAt: new Date(),
+                    user: { username: "testuser" },
+                },
+            ] as any;
+
+            mockQuery.transactions.findMany.mockResolvedValueOnce(mockTx);
+
+            const events = await dashboardService.getRecentTransactions(10);
+
+            expect(events).toHaveLength(1);
+            expect(events[0]?.type).toBe("info");
+            expect(events[0]?.message).toContain("testuser");
+            expect(events[0]?.icon).toBe("☀️");
+        });
+
+        test("should handle empty transactions", async () => {
+            mockQuery.transactions.findMany.mockResolvedValueOnce([]);
+
+            const events = await dashboardService.getRecentTransactions(10);
+            expect(events).toHaveLength(0);
+        });
+    });
+
+    describe("getRecentModerationCases", () => {
+        test("should return formatted moderation events", async () => {
+            const mockCases = [
+                {
+                    type: "warn",
+                    username: "baduser",
+                    reason: "Spam",
+                    createdAt: new Date(),
+                },
+            ] as any;
+
+            mockQuery.moderationCases.findMany.mockResolvedValueOnce(mockCases);
+
+            const events = await dashboardService.getRecentModerationCases(10);
+
+            expect(events).toHaveLength(1);
+            expect(events[0]?.type).toBe("error");
+            expect(events[0]?.message).toContain("WARN");
+            expect(events[0]?.message).toContain("baduser");
+            expect(events[0]?.icon).toBe("⚠️");
+        });
+    });
+
+    describe("getRecentEvents", () => {
+        test("should combine and sort transactions and moderation events", async () => {
+            const now = new Date();
+            const earlier = new Date(now.getTime() - 1000);
+
+            mockQuery.transactions.findMany.mockResolvedValueOnce([
+                {
+                    type: "DAILY_REWARD",
+                    description: "Daily",
+                    createdAt: now,
+                    user: { username: "user1" },
+                },
+            ] as any);
+
+            mockQuery.moderationCases.findMany.mockResolvedValueOnce([
+                {
+                    type: "warn",
+                    username: "user2",
+                    reason: "Test",
+                    createdAt: earlier,
+                },
+            ] as any);
+
+            const events = await dashboardService.getRecentEvents(10);
+
+            expect(events).toHaveLength(2);
+            // Should be sorted by timestamp (newest first)
+            expect(events[0]?.timestamp.getTime()).toBeGreaterThanOrEqual(
+                events[1]?.timestamp.getTime() ?? 0
+            );
+        });
+    });
+});