docs: auto-generate API route documentation

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Id0d1f9769b7ccdbf83d5fa78adef62e46a6a6964

docs/api/transcode.md

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+# Transcode
+
+Video transcoding sessions
+
+## Endpoints
+
+### POST /api/v1/media/{id}/transcode
+
+**Authentication:** Required (Bearer JWT)
+
+#### Parameters
+
+| Name | In | Required | Description |
+|------|----|----------|-------------|
+| `id` | path | Yes | Media item ID |
+
+#### Request Body
+
+`Content-Type: application/json`
+
+See `docs/api/openapi.json` for the full schema.
+
+#### Responses
+
+| Status | Description |
+|--------|-------------|
+| 200 | Transcode job submitted |
+| 400 | Bad request |
+| 401 | Unauthorized |
+| 500 | Internal server error |
+
+---
+
+### GET /api/v1/transcode
+
+**Authentication:** Required (Bearer JWT)
+
+#### Responses
+
+| Status | Description |
+|--------|-------------|
+| 200 | List of transcode sessions |
+| 401 | Unauthorized |
+
+---
+
+### GET /api/v1/transcode/{id}
+
+**Authentication:** Required (Bearer JWT)
+
+#### Parameters
+
+| Name | In | Required | Description |
+|------|----|----------|-------------|
+| `id` | path | Yes | Transcode session ID |
+
+#### Responses
+
+| Status | Description |
+|--------|-------------|
+| 200 | Transcode session details |
+| 401 | Unauthorized |
+| 404 | Not found |
+
+---
+
+### DELETE /api/v1/transcode/{id}
+
+**Authentication:** Required (Bearer JWT)
+
+#### Parameters
+
+| Name | In | Required | Description |
+|------|----|----------|-------------|
+| `id` | path | Yes | Transcode session ID |
+
+#### Responses
+
+| Status | Description |
+|--------|-------------|
+| 200 | Transcode session cancelled |
+| 401 | Unauthorized |
+| 404 | Not found |
+
+---
+