fix(manifest): write manifest keys with / on every platform

path.relative yields backslashes on Windows and those strings become
arweave/paths keys verbatim, so a deploy from Windows 404s every nested
asset and never matches the dir/index.html directory-index rule.

Author: vilenarios

src/utils/__tests__/cache.test.ts

@@ -239,7 +239,7 @@ describe('cache', () => {
       const files = getAllFiles(tempDir)
       expect(files).toHaveLength(2)
       expect(files).toContain('root.txt')
-      expect(files).toContain(path.join('subdir', 'nested.txt'))
+      expect(files).toContain('subdir/nested.txt')
     })
 
     it('should handle deeply nested directories', () => {
@@ -249,7 +249,19 @@ describe('cache', () => {
 
       const files = getAllFiles(tempDir)
       expect(files).toHaveLength(1)
-      expect(files).toContain(path.join('a', 'b', 'c', 'deep.txt'))
+      expect(files).toContain('a/b/c/deep.txt')
+    })
+
+    it('always separates with / so manifest keys are portable', () => {
+      const deepDir = path.join(tempDir, 'assets', 'img')
+      fs.mkdirSync(deepDir, { recursive: true })
+      fs.writeFileSync(path.join(deepDir, 'logo.svg'), '<svg />')
+
+      // These strings become arweave/paths manifest keys verbatim. A gateway
+      // resolves `assets/img/logo.svg`; a backslash key would 404.
+      const files = getAllFiles(tempDir)
+      expect(files).toEqual(['assets/img/logo.svg'])
+      expect(files.every((f) => !f.includes('\\'))).toBe(true)
     })
   })
 })

src/utils/cache.ts

@@ -69,8 +69,13 @@ export async function hashFile(filePath: string): Promise<string> {
 }
 
 /**
- * Recursively get all files in a directory
- * Returns relative paths from the base directory
+ * Recursively get all files in a directory.
+ *
+ * Returns paths relative to the base directory, always separated by `/`.
+ * `path.relative` yields backslashes on Windows, and these strings become
+ * manifest keys — a gateway looks up `assets/app.js`, so a manifest written
+ * as `assets\app.js` 404s every nested asset. Normalizing here also keeps
+ * the `dir/index.html` directory-index check working on every platform.
  */
 export function getAllFiles(dirPath: string, basePath: string = dirPath): string[] {
   const files: string[] = []
@@ -83,7 +88,7 @@ export function getAllFiles(dirPath: string, basePath: string = dirPath): string
       files.push(...getAllFiles(fullPath, basePath))
     } else {
       // Store relative path for consistent hashing
-      files.push(path.relative(basePath, fullPath))
+      files.push(path.relative(basePath, fullPath).split(path.sep).join('/'))
     }
   }