Implement file hash-based library matching and remove fuzzy ASIN matching

Adds file hash-based matching for Audiobookshelf library items to ensure 100% accurate ASIN assignment for RMAB-organized content. Removes fuzzy matching from library availability checks, making all matching ASIN-only to eliminate false positives and race conditions. Updates database schema, processors, and matcher utilities; adds new tests and documentation for the new matching strategy. Removes obsolete scripts, Dockerfile, and related tests; updates docker-compose for test environments.

tests/app/admin/components/ActiveDownloadsTable.test.tsx

@@ -0,0 +1,52 @@
+/**
+ * Component: Active Downloads Table Tests
+ * Documentation: documentation/admin-dashboard.md
+ */
+
+// @vitest-environment jsdom
+
+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { ActiveDownloadsTable } from '@/app/admin/components/ActiveDownloadsTable';
+
+describe('ActiveDownloadsTable', () => {
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it('renders an empty state when no downloads exist', () => {
+    render(<ActiveDownloadsTable downloads={[]} />);
+
+    expect(screen.getByText('No Active Downloads')).toBeInTheDocument();
+  });
+
+  it('renders download details with formatted values', () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2024-01-01T00:00:00Z'));
+
+    render(
+      <ActiveDownloadsTable
+        downloads={[
+          {
+            requestId: 'req-1',
+            title: 'Active Book',
+            author: 'Author One',
+            progress: 42,
+            speed: 1024 * 1024,
+            eta: 3600,
+            user: 'Zach',
+            startedAt: new Date('2023-12-31T23:00:00Z'),
+          },
+        ]}
+      />
+    );
+
+    expect(screen.getByText('Active Book')).toBeInTheDocument();
+    expect(screen.getByText('Author One')).toBeInTheDocument();
+    expect(screen.getByText('42%')).toBeInTheDocument();
+    expect(screen.getByText('1 MB/s')).toBeInTheDocument();
+    expect(screen.getByText('1h 0m')).toBeInTheDocument();
+    expect(screen.getByText(/ago/)).toBeInTheDocument();
+  });
+});