refactor: convert to bun workspaces monorepo

- Move web app into apps/web/
- Create packages/shared/ with shared types
- Create plugins/decky-vault/ scaffold
- Root package.json manages workspaces only

apps/web/lib/api/__tests__/check-email.test.ts

@@ -0,0 +1,64 @@
+import { describe, it, expect } from "vitest"
+import { loginEmailSchema } from "@/lib/auth/validation"
+
+describe("check-email validation", () => {
+  it("accepts valid email", () => {
+    const result = loginEmailSchema.safeParse({ email: "user@example.com" })
+    expect(result.success).toBe(true)
+  })
+
+  it("rejects missing email", () => {
+    const result = loginEmailSchema.safeParse({})
+    expect(result.success).toBe(false)
+  })
+
+  it("rejects invalid email format", () => {
+    const result = loginEmailSchema.safeParse({ email: "not-email" })
+    expect(result.success).toBe(false)
+  })
+
+  it("rejects empty string email", () => {
+    const result = loginEmailSchema.safeParse({ email: "" })
+    expect(result.success).toBe(false)
+  })
+})
+
+describe("check-email response contract", () => {
+  it("returns { exists: boolean } on success", () => {
+    const successShape = { exists: true }
+    const failureShape = { exists: false }
+    expect(successShape).toHaveProperty("exists")
+    expect(failureShape).toHaveProperty("exists")
+    expect(typeof successShape.exists).toBe("boolean")
+    expect(typeof failureShape.exists).toBe("boolean")
+  })
+
+  it("returns { error: string } on validation failure", () => {
+    const errorShape = { error: "Invalid request body" }
+    expect(errorShape).toHaveProperty("error")
+    expect(typeof errorShape.error).toBe("string")
+  })
+})
+
+describe("check-email does NOT block deckyvault.xyz for login", () => {
+  it("accepts a @deckyvault.xyz email through loginEmailSchema", () => {
+    const result = loginEmailSchema.safeParse({
+      email: "admin@deckyvault.xyz",
+    })
+    expect(result.success).toBe(true)
+  })
+
+  it("accepts a @DECKYVAULT.XYZ email (uppercase) through loginEmailSchema", () => {
+    const result = loginEmailSchema.safeParse({
+      email: "admin@DECKYVAULT.XYZ",
+    })
+    expect(result.success).toBe(true)
+  })
+
+  it("the response contract still matches { exists: boolean }", () => {
+    const successShape = { exists: true }
+    const failureShape = { exists: false }
+    expect(typeof successShape.exists).toBe("boolean")
+    expect(typeof failureShape.exists).toBe("boolean")
+  })
+})