feat: add customInputs node for declarative wizard question sequences

[qfai]

Add a generic 'customInputs' node type to constructNode.ts that allows wizard JSON to declare arbitrary question sequences without TypeScript code changes. Supports:

• text inputs (with optional password masking)
• singleSelect dropdowns (with static options)
• singleFile browser
• folder picker
• conditional inputs (multi-level menus via condition on inputs)

User answers are stored in inputs._customInputs and automatically injected into the template replace map, so template .tpl files can reference them as {{inputName}}.

This enables dynamic template publish to onboard new templates with custom wizard flows without requiring a new extension release.

[codecov]

Codecov Report

❌ Patch coverage is 35.08772% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.85%. Comparing base (858d4de) to head (7b5a582).

Files with missing lines	Patch %	Lines
...ges/fx-core/src/question/scaffold/constructNode.ts	32.69%	35 Missing ⚠️
...omponent/generator/templates/templateReplaceMap.ts	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #15655      +/-   ##
==========================================
- Coverage   92.93%   92.85%   -0.09%     
==========================================
  Files         623      623              
  Lines       38444    38499      +55     
  Branches     6985     7003      +18     
==========================================
+ Hits        35729    35747      +18     
- Misses       1984     2019      +35     
- Partials      731      733       +2     

Files with missing lines	Coverage Δ
...omponent/generator/templates/templateReplaceMap.ts	93.84% <60.00%> (-2.88%)	⬇️
...ges/fx-core/src/question/scaffold/constructNode.ts	68.90% <32.69%> (-29.63%)	⬇️

... and 1 file with indirect coverage changes

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