new script: item-uses - show all workshop uses for selected item

docs/item-uses.rst

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+item-uses
+=========
+
+.. dfhack-tool::
+    :summary: Lists all workshops and tasks where a specific item can be used.
+    :tags: fort inspection
+
+This script analyzes the selected item and determines exactly which workshops
+can accept it as a reagent, and what reactions or tasks can be performed with it.
+It automatically distinguishes between raw materials (like ores or logs) and finished
+goods, as well as checking for applicable tasks like encrusting, melting, and milling.
+
+Usage
+-----
+
+::
+
+    item-uses
+
+Select an item in the game UI (e.g. using the ``k`` cursor, or viewing an item
+in a stockpile or inventory) and run the command. The script will output a
+categorized list of all compatible workshops and their relevant tasks.