[bridge]: resolve OpenAPI spec URL dynamically based on current path

[cryptoBeliever]

Problem

Swagger UI was failing to load the OpenAPI spec when served under prefixed paths (e.g. /testnet/ethereum-wrapped/openapi).
Relative paths like ../static/... were resolved incorrectly, resulting in 404 Not Found.

Solution

The OpenAPI spec URL is now derived dynamically from window.location.pathname by removing the /openapi suffix and appending the expected static spec location.

This allows the same index.html to work correctly under:

• /openapi
• /testnet/ethereum-wrapped/openapi

without any environment-specific configuration.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.14%. Comparing base (a046987) to head (7ceaee0).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1864   +/-   ##
=======================================
  Coverage   96.14%   96.14%           
=======================================
  Files         343      343           
  Lines       23805    23805           
  Branches      402      402           
=======================================
  Hits        22887    22887           
  Misses        905      905           
  Partials       13       13           

Flag	Coverage Δ
bridge	99.65% <ø> (ø)
explorer-frontend	95.00% <ø> (ø)
explorer-nodewatch	98.57% <ø> (ø)
explorer-rest	99.25% <ø> (ø)
faucet-authenticator	100.00% <ø> (ø)
faucet-backend	98.77% <ø> (ø)
faucet-frontend	100.00% <ø> (ø)
lightapi-python	98.67% <ø> (ø)
tools-shoestring	97.06% <ø> (ø)
wallet-common-core	97.06% <ø> (ø)
wallet-common-ethereum	99.01% <ø> (ø)
wallet-common-symbol	95.28% <ø> (ø)
wallet-mobile-symbol	92.97% <ø> (ø)

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[Wayonb]

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