docs: add per-tool API documentation and fix parity gaps

- Create 53 per-tool VitePress documentation pages with accurate
  parameters from Zod schemas, example requests, and response formats
- Add root llms.txt for LLM-friendly repo browsing
- Fix OpenAPI spec: add auth and 422 error schemas to
  edit-metadata/inspect and strip-metadata/inspect sub-routes
- Fix tool count inconsistency (52 -> 53) across landing site,
  e2e tests, and local docs
- Rename color-adjustments.ts to adjust-colors.ts to match tool ID
- Update VitePress sidebar with all 8 tool categories and top nav

apps/docs/tools/meme-generator.md

@@ -0,0 +1,89 @@
+---
+description: Create memes with templates or custom images, styled text boxes, and font options.
+---
+
+# Meme Generator
+
+Create memes using built-in templates or custom images. Add text with classic meme styling (bold, outlined text), multiple layout presets, and font choices.
+
+## API Endpoint
+
+`POST /api/v1/tools/meme-generator`
+
+Accepts either:
+- **Multipart form data** with an image file and a JSON `settings` field (custom image mode)
+- **JSON body** with a `templateId` (template mode, no file upload needed)
+
+## Parameters
+
+| Parameter | Type | Required | Default | Description |
+|-----------|------|----------|---------|-------------|
+| templateId | string | No | - | Built-in meme template ID. If provided, no image upload is needed |
+| textLayout | string | No | `"top-bottom"` | Text box layout: `top-bottom`, `top-only`, `bottom-only`, `center`, `side-by-side` |
+| textBoxes | array | No | `[]` | Array of text box objects with `id` and `text` fields |
+| fontFamily | string | No | `"anton"` | Font: `anton`, `arial-black`, `comic-sans`, `montserrat`, `bebas-neue`, `permanent-marker`, `roboto` |
+| fontSize | number | No | auto | Font size in pixels (8 to 200). Auto-calculated if omitted |
+| textColor | string | No | `"#ffffff"` | Text fill color |
+| strokeColor | string | No | `"#000000"` | Text stroke/outline color |
+| textAlign | string | No | `"center"` | Text alignment: `left`, `center`, `right` |
+| allCaps | boolean | No | `true` | Convert text to uppercase |
+
+### Text Boxes
+
+Each entry in the `textBoxes` array should have:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| id | string | Box identifier matching the layout (e.g., `"top"`, `"bottom"`, `"left"`, `"right"`, `"center"`) |
+| text | string | The meme text to display |
+
+### Text Layout Box IDs
+
+| Layout | Available Box IDs |
+|--------|-------------------|
+| `top-bottom` | `top`, `bottom` |
+| `top-only` | `top` |
+| `bottom-only` | `bottom` |
+| `center` | `center` |
+| `side-by-side` | `left`, `right` |
+
+## Example Request
+
+Custom image with top and bottom text:
+
+```bash
+curl -X POST http://localhost:1349/api/v1/tools/meme-generator \
+  -H "Authorization: Bearer si_your-api-key" \
+  -F "file=@photo.jpg" \
+  -F 'settings={"textLayout": "top-bottom", "textBoxes": [{"id": "top", "text": "When the code works"}, {"id": "bottom", "text": "On the first try"}], "fontFamily": "anton", "allCaps": true}'
+```
+
+Using a built-in template (JSON body, no file upload):
+
+```bash
+curl -X POST http://localhost:1349/api/v1/tools/meme-generator \
+  -H "Authorization: Bearer si_your-api-key" \
+  -H "Content-Type: application/json" \
+  -d '{"templateId": "drake", "textBoxes": [{"id": "top", "text": "Manual testing"}, {"id": "bottom", "text": "Automated tests"}]}'
+```
+
+## Example Response
+
+```json
+{
+  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/meme-drake.png",
+  "originalSize": 450000,
+  "processedSize": 520000
+}
+```
+
+## Notes
+
+- Either `templateId` or an uploaded image file is required. Providing both uses the template.
+- Templates define their own text box positions; the `textLayout` parameter is ignored when using templates.
+- Text is rendered as SVG with stroke outlines for the classic meme look.
+- Font size is auto-calculated to fit the text box if not explicitly set.
+- Empty text boxes are skipped (no rendering occurs if all boxes are empty).
+- The output filename includes the template ID when using templates (e.g., `meme-drake.png`).
+- HEIC, RAW, PSD, and SVG inputs are automatically decoded before processing.