feat: reposition to self-hosted file-processing infrastructure (#469)

Leads public copy with self-hosted file-processing infrastructure and demotes tool count to a proof point across README, docs, llms.txt, DockerHub, and the landing site. Adds a /self-hosted hub plus 7 job-intent SEO pages with a build-time validator, deepens the flagship /alternatives pages, adds a remove.bg page, three shared components, and landing e2e coverage.

tests/e2e-landing/self-hosted.spec.ts

@@ -0,0 +1,49 @@
+import { expect, test } from "@playwright/test";
+
+const SLUGS = [
+  "image-compressor",
+  "pdf-ocr",
+  "video-converter",
+  "background-removal",
+  "transcription",
+  "file-conversion-api",
+  "metadata-removal",
+];
+
+test.describe("Self-hosted hub", () => {
+  test("renders the hub heading and lists use-case cards", async ({ page }) => {
+    const res = await page.goto("/self-hosted");
+    expect(res?.status()).toBeLessThan(400);
+    await expect(page.getByRole("heading", { name: "Self-hosted file processing" })).toBeVisible();
+    await expect(page.locator('a[href^="/self-hosted/"]')).not.toHaveCount(0);
+  });
+});
+
+test.describe("Self-hosted spokes", () => {
+  for (const slug of SLUGS) {
+    test(`/self-hosted/${slug} renders and sets a unique canonical`, async ({ page }) => {
+      const res = await page.goto(`/self-hosted/${slug}`);
+      expect(res?.status()).toBeLessThan(400);
+      await expect(page.locator("main h1")).toBeVisible();
+      await expect(page.locator('link[rel="canonical"]')).toHaveAttribute(
+        "href",
+        `https://snapotter.com/self-hosted/${slug}`,
+      );
+    });
+  }
+});
+
+test.describe("pdf-ocr spoke details", () => {
+  test("emits FAQ JSON-LD and links to a real tool page", async ({ page }) => {
+    await page.goto("/self-hosted/pdf-ocr");
+    await expect(page.locator("main h1")).toContainText("Self-hosted PDF OCR");
+
+    const ld = await page.locator('script[type="application/ld+json"]').allTextContents();
+    expect(ld.some((t) => t.includes('"FAQPage"'))).toBe(true);
+
+    const toolLink = page.locator('a[href="/tools/pdf/ocr-pdf"]').first();
+    await expect(toolLink).toBeVisible();
+    const toolRes = await page.request.get("/tools/pdf/ocr-pdf");
+    expect(toolRes.status()).toBeLessThan(400);
+  });
+});