fix: technical debts left by the Sites, Authors and SEO slices, plus backend support for the new Sites and Authors pagination

docs/api.md

@@ -22,11 +22,11 @@ for example `https://cms.example/v1/article/`.
   under `/v1/site`) and the author writes (`POST`, `PATCH` and `DELETE` under `/v1/author`, `POST /v1/author/me` included) are session only too.
 - Each key can make 120 requests per minute. Beyond that: 429 with a `Retry-After` header.
 
-## Routes a key can call (29)
+## Routes a key can call (30)
 | Group | Routes |
 | --- | --- |
 | Articles | GET /v1/article/, GET /v1/article/{id}, GET /v1/article/{id}/seo, POST /v1/article/{id}/seo/check, POST /v1/article/, PATCH /v1/article/{id}, PATCH /v1/article/{id}/publish, PATCH /v1/article/{id}/unpublish, DELETE /v1/article/{id} |
-| Media | GET /v1/media/, POST /v1/media/, PATCH /v1/media/{id}, DELETE /v1/media/{id}, POST /v1/media/merge, GET /v1/media/{id}/usage, GET /v1/media/purge-settings (owner or admin), PATCH /v1/media/purge-settings (owner or admin), GET /v1/media/purge-preview (owner or admin), POST /v1/media/purge (owner or admin), GET /v1/media/{id}/variants (owner or admin, session only), POST /v1/media/{id}/variants (owner or admin, session only), POST /v1/media/{id}/variants/{name} (owner or admin, session only), DELETE /v1/media/{id}/variants/{name} (owner or admin, session only) |
+| Media | GET /v1/media/, GET /v1/media/{id}, POST /v1/media/, PATCH /v1/media/{id}, DELETE /v1/media/{id}, POST /v1/media/merge, GET /v1/media/{id}/usage, GET /v1/media/purge-settings (owner or admin), PATCH /v1/media/purge-settings (owner or admin), GET /v1/media/purge-preview (owner or admin), POST /v1/media/purge (owner or admin), GET /v1/media/{id}/variants (owner or admin, session only), POST /v1/media/{id}/variants (owner or admin, session only), POST /v1/media/{id}/variants/{name} (owner or admin, session only), DELETE /v1/media/{id}/variants/{name} (owner or admin, session only) |
 | Users and invites | GET /v1/user/, PATCH /v1/user/me, POST /v1/user/invite (owner only), DELETE /v1/user/invite/{id} (owner only), POST /v1/user/invite/{id}/renew (owner only), GET /v1/auth/me (with the linked `author`) |
 | Settings | GET /v1/settings |
 | Sites | GET /v1/site/, GET /v1/site/{key}/sitemap |
@@ -115,6 +115,11 @@ with `items: []` and the real `total`. Any invalid `page`, `size`, `filter`, `so
 `hash` is 400 "The media query is invalid.". Every item carries `variant_count` and `variant_size`
 (the index rows of the image and their bytes, 0 when none).
 
+`GET /v1/media/{id}` reads one image with the same auth as the list (a verified session or an API key; 403 for an
+unverified account, 401 without credentials) and writes nothing, so it records no activity event. It answers 200 with
+the object of one `items` element of the list, a missing image is 404 "Image not found" and a malformed id is 400 with
+the id-format message.
+
 Breaking change: `next_cursor` is gone and no `X-Total-Count` header is sent. `cursor` and `limit`
 are no longer parameters; they are ignored, never an error, and have no effect on paging.
 
@@ -132,7 +137,7 @@ session." with a key). The role is checked before the body.
 
 | Route | Purpose |
 | --- | --- |
-| `GET /v1/site/` | The sites, default first and then by name, each with `article_count`. |
+| `GET /v1/site/` | The sites, default first and then by name, each with `article_count`. Query `q` (up to 200 characters, matched in `name`, `key` or `base_url`, ignoring case and accents, `%` and `_` literal), `page` (a whole number from 1) and `size` (5, 25, 50 or 100). Without `page` and `size` every matching site is returned; with only `page`, `size` is 25; with only `size`, `page` is 1. The body stays a JSON array (`[]` when nothing matches, never `null`) and `X-Total-Count` holds the number of matching sites before paging. A page past the end is `200 []` with the total. An invalid `page`, `size` or `q` is 400 with the body-mismatch message and no `X-Total-Count`. |
 | `POST /v1/site/` | Create. 201 with the site. `is_default: true` makes it the default. `site_name`, `title_template` and `default_description` are optional and validated like on `PATCH`. |
 | `PATCH /v1/site/{id}` | Edit `name`, `base_url`, `default_robots`, `locale`, `default_social_image_id`, `site_name`, `title_template`, `default_description`. Absent fields are untouched. `key` may only be repeated unchanged; `is_default` is refused. |
 | `PATCH /v1/site/{id}/default` | Make the site the default, atomically. Setting the current default is a no-op. |
@@ -238,7 +243,7 @@ article is allowed and never blocks publishing.
 
 | Route | Who | Purpose |
 | --- | --- | --- |
-| `GET /v1/author/` | verified session or API key | The authors newest first. Query `q` (name or slug, accent and case insensitive), `page` (default 1), `size` (5, 25, 50 or 100, default 25). Body `{ items, total, page, size }`; a bad query is 400 with the body-mismatch message. |
+| `GET /v1/author/` | verified session or API key | The authors newest first. Query `q` (name or slug, accent and case insensitive), `page` (default 1), `size` (5, 25, 50 or 100, default 25). Body `{ items, total, page, size }`, with `total` repeated in the `X-Total-Count` header on every 200; a bad query is 400 with the body-mismatch message and no header. |
 | `POST /v1/author/` | owner or admin, session only | Create. 201 with the author. `user_id` links an account that has no author. |
 | `POST /v1/author/me` | any verified session | Create the caller's own author from the display name (or the username). A taken slug gets `-2`, `-3`... silently. 201 with the author plus `slug_adjusted`: `true` when the stored slug differs from the plain slug of the name (a collision suffix was added), `false` otherwise. No other author response carries this field. |
 | `PATCH /v1/author/{id}` | owner or admin on any author; any verified session on the author linked to it; session only | Edit `name`, `slug`, `bio`, `avatar_id`, `website`, `social_links`, `user_id`. Absent fields are untouched, `avatar_id`, `website` and `user_id` accept `null`, `social_links` is replaced as a whole. `user_id` links or unlinks the account and is owner or admin only. |