Add article history by SKU and SSE update signals for live clients.

Expose getHistoryBySku as GET /article/:sku/history, and document mutation-emitted company signals via GET /events.

docs/api/routes/category/add-image.md

@@ -20,6 +20,10 @@ Auth like GET /category/tree — user must be authorized for the category's comp
 
 Raw binary (`image/avif`).
 
+## Signals
+
+On success, emits SSE signal: `category` (see [`GET /events`](../events.md)).
+
 ## Response `201`
 
 Image stored and linked

docs/api/routes/category/create.md

@@ -15,6 +15,10 @@ Creates a category under an authorized parent.
 }
 ```
 
+## Signals
+
+On success, emits SSE signal: `category` (see [`GET /events`](../events.md)).
+
 ## Response `201`
 
 Created

docs/api/routes/category/delete-image.md

@@ -14,6 +14,10 @@ Auth like GET /category/tree — user must be authorized for the category's comp
 |-------|----------|------|-------------|
 | `id` | yes | integer | Category id |
 
+## Signals
+
+On success, emits SSE signal: `category` (see [`GET /events`](../events.md)).
+
 ## Response `200`
 
 Image removed

docs/api/routes/category/delete.md

@@ -12,6 +12,10 @@ Deletes a category the user is authorized for (not the company root).
 |-------|----------|------|-------------|
 | `id` | yes | integer | Category id |
 
+## Signals
+
+On success, emits SSE signal: `category` (see [`GET /events`](../events.md)).
+
 ## Response `204`
 
 Deleted

docs/api/routes/category/order.md

@@ -24,6 +24,10 @@ to its index `0..n-1` in one transaction.
 }
 ```
 
+## Signals
+
+On success, emits SSE signal: `category` (see [`GET /events`](../events.md)).
+
 ## Response `200`
 
 New sibling order

docs/api/routes/category/update.md

@@ -24,6 +24,10 @@ Either `name` or `parentId` (or both) is required.
 }
 ```
 
+## Signals
+
+On success, emits SSE signal: `category` (see [`GET /events`](../events.md)).
+
 ## Response `200`
 
 Updated category (renamed and/or moved)