feat(ui/design): Monaco editor for script code fields

Vendors Monaco 0.55.1 min/vs/ (~15 MB) at
wwwroot/lib/monaco/vs/. No CDN dependency; works on air-gapped
deployments. Loaded lazily on first script-edit via the AMD loader.

wwwroot/js/monaco-init.js exposes window.MonacoBlazor with
createEditor / setValue / getValue / setMarkers / dispose. Handles
loader bootstrap, DotNet round-trip on content change, and marker
sets for later diagnostic wiring.

Components/Shared/MonacoEditor.razor is a Blazor wrapper with
Value / ValueChanged / Language / Height / ReadOnly parameters and
IAsyncDisposable teardown. Bidirectional binding tracks
_lastSentValue to avoid push/pull loops.

Replaces the plain textareas in SharedScriptForm, TemplateEdit's
Add-Script form, and ApiMethodForm. Default height 320px ≈ the
previous rows=10. Build / tests / dialog flow unaffected.

Wave 1 of three. Roslyn-backed completions and SCADA-specific
extensions follow in subsequent commits.

src/ScadaLink.CentralUI/wwwroot/lib/monaco/vs/javascript-PczUCGdz.js

@@ -0,0 +1 @@
+define("vs/javascript-PczUCGdz",["exports","./typescript-DfOrAzoV"],(function(a,e){"use strict";const n=e.conf,g={defaultToken:"invalid",tokenPostfix:".js",keywords:["break","case","catch","class","continue","const","constructor","debugger","default","delete","do","else","export","extends","false","finally","for","from","function","get","if","import","in","instanceof","let","new","null","return","set","static","super","switch","symbol","this","throw","true","try","typeof","undefined","var","void","while","with","yield","async","await","of"],typeKeywords:[],operators:e.language.operators,symbols:e.language.symbols,escapes:e.language.escapes,digits:e.language.digits,octaldigits:e.language.octaldigits,binarydigits:e.language.binarydigits,hexdigits:e.language.hexdigits,regexpctl:e.language.regexpctl,regexpesc:e.language.regexpesc,tokenizer:e.language.tokenizer};a.conf=n,a.language=g,Object.defineProperty(a,Symbol.toStringTag,{value:"Module"})}));