Extract parse_bool_env helper to deduplicate boolean parsing logic

[Copilot]

Boolean parsing for environment variables was duplicated across configuration.rs and middleware/authorization.rs using identical matches!(value.as_str(), "1" | "true" | "TRUE") patterns.

Changes

• Extracted parse_bool_env(value: &str) -> bool helper in configuration.rs

  • Handles "1", "true", "TRUE" → true
  • All other values → false

• Updated call sites to use the helper:

  • configuration.rs:273 - STACKER_CASBIN_RELOAD_ENABLED parsing
  • middleware/authorization.rs:38 - Same variable in policy reloader

• Added unit tests covering true/false cases and edge cases (empty strings, mixed case, etc.)

// Before
if let Ok(enabled) = std::env::var("STACKER_CASBIN_RELOAD_ENABLED") {
    config.casbin_reload_enabled = matches!(enabled.as_str(), "1" | "true" | "TRUE");
}

// After
if let Ok(enabled) = std::env::var("STACKER_CASBIN_RELOAD_ENABLED") {
    config.casbin_reload_enabled = parse_bool_env(&enabled);
}

---

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