feat(core): Add slash command link for linking items to tickets

ref: #296 #308

docs/projects/centurion_erp/development/models.md

@@ -49,7 +49,9 @@ All models must meet the following requirements:
 
 This section details the additional items that may need to be done when adding a new model:
 
-- If the model is a primary model, add to model reference rendering in `app/core/lib/markdown_plugins/model_reference.py` function `tag_html`
+- If the model is a primary model, add it to model reference rendering in `app/core/lib/markdown_plugins/model_reference.py` function `tag_html`
+
+- If the model is a primary model, add it to the model link slash command in `app/core/lib/slash_commands/linked_model.py` function `command_linked_model`
 
 
 ## History

docs/projects/centurion_erp/user/core/tickets.md

@@ -13,6 +13,12 @@ The ticketing system within Centurion ERP is common to all ticket types. The dif
 
 - Commenting
 
+- Linked Items to ticket
+
+- Milestone
+
+- Project
+
 - Related Tickets
 
 - Slash commands
@@ -47,6 +53,8 @@ Comment types are:
 
 Slash commands are a quick action that is specified after a slash command. As the name implies, the command starts with a slash `/`. The following slash commands are available:
 
+- Linked Item `link`
+
 - Related `/blocked_by`, `/blocks` and `/relate`
 
 - Time Spent `/spend`, `/spent`
@@ -63,6 +71,17 @@ Slash commands are a quick action that is specified after a slash command. As th
         summary: true
 
 
+### Linked Items
+
+::: app.core.lib.slash_commands.CommandLinkedModel
+    options:
+        inherited_members: false
+        members: []
+        show_bases: false
+        show_submodules: false
+        summary: true
+
+
 ### Related Tickets
 
 ::: app.core.lib.slash_commands.CommandRelatedTicket