Dynamic template connection with index for open page

[kjellMenu]

📌 Description

Please describe the changes introduced by this Pull Request.

• What problem does this solve?
  It addresses the scalability issue when working with User Defined Types (UDTs) and indexed tags (e.g., UDT Veld.Motor[0], UDT Veld.Motor[1]) from a single (OPC UA) connection. Currently, FUXA requires manual placeholder coupling or creating separate target devices for every single instance, which becomes inefficient in large-scale environments. This solution introduces a proof of concept to dynamically bind structured tag names to a single Template screen upon page navigation.

  *This Draft PR was created in response to the discussion thread Best practices for scalable UDTs and Template Screens with OPC UA? #2476

• What was changed?
  The frontend runtime component (client/src/app/fuxa-view/fuxa-view.component.ts) was modified to intercept and resolve structured tag paths dynamically when a page loads.

  1. A new function applyIndexedTagMapping() was added to strip a temporary @ validation token, read the target index, and resolve the string name.
  2. It searches FUXA's internal tag configuration by name/address to map the temporary template binding directly to the concrete internal FUXA Tag ID.
  3. Currently, the code reads a global internal server tag called Index during the loadPage() command to trigger the resolution.

  ⚠️ Note: This code is an experimental prototype implemented to evaluate architectural feasibility for my Master's thesis scalability testing. Because it is meant strictly as a functional proof of concept, it lacks comprehensive error handling, is not optimized for production, and currently only triggers via the "open page" command.

• Why is this needed?
  This functionality eliminates the need to manually assign every single tag to a template screen. When working with a single PLC tag connection, it allows you to dynamically handle hundreds of identical template screens (like motors or valves) via text-based mapping, significantly reducing engineering configuration overhead and improving project scalability.

🧪 Type of Change

Please mark the relevant option:

• Bug fix
• New feature
• Refactoring
• Documentation
• Other

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🚫 Build Artifacts Check

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• I did NOT commit /client/dist
• I did NOT commit generated Angular build output
• Only source files are included