feat: 扩展 Rust gateway 全功能模块，新增 billing/crypto/wallet crate 及完整数据层

- 新增 aether-billing、aether-crypto、aether-wallet 独立 crate
- aether-data 扩展 repository 层：announcements、auth_modules、billing、
  candidate_selection、gemini_file_mappings、global_models、management_tokens、
  oauth_providers、proxy_nodes、quota、users、wallet 等模块
- aether-gateway 新增 api/auth/billing/control/middleware/scheduler/usage/
  video_tasks/hooks/maintenance/model_fetch/provider_transport 等功能模块
- 重构 executor decision 和 gateway state 为模块目录结构
- 新增 gateway router、frontdoor 路由层及对应测试
- Python 侧 API 路由重构，新增 compat/support 模块
- 前端 Logo 组件更新及 Provider 管理页面调整

crates/aether-billing/src/token_normalization.rs

@@ -0,0 +1,69 @@
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum ApiFamily {
+    OpenAi,
+    Claude,
+    Gemini,
+    Unknown,
+}
+
+fn parse_api_family(api_format: Option<&str>) -> ApiFamily {
+    let Some(api_format) = api_format else {
+        return ApiFamily::Unknown;
+    };
+    let family = api_format
+        .split(':')
+        .next()
+        .unwrap_or_default()
+        .trim()
+        .to_ascii_lowercase();
+    match family.as_str() {
+        "openai" => ApiFamily::OpenAi,
+        "claude" | "anthropic" => ApiFamily::Claude,
+        "gemini" | "google" => ApiFamily::Gemini,
+        _ => ApiFamily::Unknown,
+    }
+}
+
+pub fn normalize_input_tokens_for_billing(
+    api_format: Option<&str>,
+    input_tokens: i64,
+    cache_read_tokens: i64,
+) -> i64 {
+    if input_tokens <= 0 {
+        return input_tokens.max(0);
+    }
+    if cache_read_tokens <= 0 {
+        return input_tokens;
+    }
+
+    match parse_api_family(api_format) {
+        ApiFamily::Claude => input_tokens,
+        ApiFamily::OpenAi | ApiFamily::Gemini => (input_tokens - cache_read_tokens).max(0),
+        ApiFamily::Unknown => input_tokens,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::normalize_input_tokens_for_billing;
+
+    #[test]
+    fn subtracts_cache_tokens_for_openai_and_gemini() {
+        assert_eq!(
+            normalize_input_tokens_for_billing(Some("openai:chat"), 100, 20),
+            80
+        );
+        assert_eq!(
+            normalize_input_tokens_for_billing(Some("gemini:chat"), 100, 20),
+            80
+        );
+    }
+
+    #[test]
+    fn keeps_input_tokens_for_claude() {
+        assert_eq!(
+            normalize_input_tokens_for_billing(Some("claude:chat"), 100, 20),
+            100
+        );
+    }
+}