Read values from .env file for the sample app

[sahandilshan]

Purpose

Fix #553

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.48%. Comparing base (0ae7a70) to head (817697d).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #554      +/-   ##
==========================================
- Coverage   60.63%   60.48%   -0.16%     
==========================================
  Files         147      149       +2     
  Lines       19097    19076      -21     
==========================================
- Hits        11580    11538      -42     
- Misses       6188     6210      +22     
+ Partials     1329     1328       -1     

Flag	Coverage Δ
backend-combined-postgres	51.92% <ø> (-0.07%)	⬇️
backend-combined-sqlite	51.92% <ø> (-0.07%)	⬇️
backend-integration-postgres	51.92% <ø> (-0.07%)	⬇️
backend-integration-sqlite	51.92% <ø> (-0.07%)	⬇️
backend-unit	18.44% <ø> (-0.37%)	⬇️

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[Copilot]

Pull Request Overview

Reads configuration from environment variables in development and from runtime.json in production for the OAuth sample app, addressing issue #553.

• Introduces a helper to resolve config values, preferring .env in dev and filtering out placeholder values from runtime.json.
• Updates config mappings to use the helper and adds redirectUri resolution through the same path.
• Updates README with separate development and production configuration instructions.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
samples/apps/oauth/src/config.tsx	Adds getConfigValue helper and updates config resolution to prefer .env in dev and runtime.json in prod.
samples/apps/oauth/README.md	Documents dev (.env) vs prod (runtime.json) configuration with examples and precedence notes.

[ThaminduDilshan]

Let's squash and merge

[Copilot]

Pull Request Overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

[Copilot]

Pull Request Overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.