Replace manual URL encoding with serde_urlencoded library in Aliyun CDN client

[Copilot]

Replaced manual form URL encoding implementation in src/aliyun/cdn.rs with the standard serde_urlencoded library for better reliability and maintainability.

Changes

• Added dependency: serde_urlencoded = "0.7.1" to Cargo.toml
• Created struct: Added RefreshObjectCachesFormParams struct with proper serde field renaming for type-safe URL encoding
• Refactored encoding: Replace build_form_urlencoded_body() call with serde_urlencoded::to_string() using the new struct
• Removed 26 lines: Deleted manual build_form_urlencoded_body() and form_urlencode() helper functions

Before

let mut form_params = BTreeMap::new();
form_params.insert("ObjectPath".to_string(), request.object_path.clone());
// ... manual conditional insertions
let form_body = build_form_urlencoded_body(&form_params);

After

let form_params = RefreshObjectCachesFormParams {
    object_path: request.object_path.clone(),
    object_type: request.object_type.clone(),
    force: request.force,
};

let form_body = serde_urlencoded::to_string(&form_params)
    .context("Failed to encode form parameters")?;

The standard library handles edge cases and encoding rules more robustly than the custom implementation. Using a dedicated struct instead of BTreeMap provides compile-time type safety and clearer intent. The force field maintains its native Option<bool> type for cleaner serialization.

Original prompt

On cdn.rs:270-270, https://github.com/daflyinbed/janus/blob/aliyun/src/aliyun/cdn.rs#L270 改成用serde_urlencoded库来做

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[daflyinbed]

@copilot 改成用一个struct而不是btreemap

[Copilot]

Done. Created RefreshObjectCachesFormParams struct with proper serde field renaming for URL encoding. Commit d88d784

[daflyinbed]

@copilot 用bool

[Copilot]

Changed force field to Option for cleaner serialization. Commit 7c3016e