feat(stdproject): 获取巨量智擎版标准投放项目和素材能力

[flowerbin]

新增标准项目列表获取、项目下素材查询接口，配套新增相关枚举定义与文档注释，完善SDK文档说明

官方文档: https://bytedance.larkoffice.com/docx/BH6zdu3j2o9hiGxr4oucedjFnGb

[gemini-code-assist]

Code Review

This pull request introduces the OceanEngine Marketing API's standard delivery capabilities (api/v3/stdproject), adding endpoints to list standard projects and retrieve materials, along with their associated request/response models and enums. The review feedback highlights type inconsistencies for ProductID and GameAddictionID between the StdProject and ListFilter structs, where they are defined as string in one and uint64 in the other, which could cause unmarshaling issues.

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[gemini-code-assist]

The ProductID field is defined as string here, but in ListFilter (in list.go), it is defined as uint64. This type inconsistency can lead to unmarshaling errors or integration issues when mapping fields. Please make the types consistent across both structs.

Suggested change

	// ProductID 产品ID
	ProductID string `json:"product_id,omitempty"`
	// ProductID 产品ID
	ProductID uint64 `json:"product_id,omitempty"`

[gemini-code-assist]

The GameAddictionID field is defined as string here, but in ListFilter (in list.go), it is defined as uint64. This type inconsistency can lead to unmarshaling errors or integration issues. Please make the types consistent across both structs.

Suggested change

	// GameAddictionID 关键行为ID
	GameAddictionID string `json:"game_addiction_id,omitempty"`
	// GameAddictionID 关键行为ID
	GameAddictionID uint64 `json:"game_addiction_id,omitempty"`