refact: Migrate from python seekdb (legacy) to seekdb-rs

[dengfuping]

Summary

• Related PR: feat: Integrate libseekdb to support embedded mode seekdb-rs#4

Solution Description

• Before: based on python seekdb (legacy and depend on python runtime)

• After: based on seekdb-rs

graph TB
    subgraph Frontend["Frontend Layer"]
        UI[React UI Components]
        State[State Management]
    end

    subgraph Command["Command Layer (Tauri)"]
        CMD_Project[Project Commands]
        CMD_Doc[Document Commands]
        CMD_Chat[Conversation Commands]
        CMD_Speech[Speech Commands]
    end

    subgraph Service["Service Layer (Rust)"]
        SVC_Project[ProjectService]
        SVC_Doc[DocumentService]
        SVC_Conv[ConversationService]
        SVC_Embed[EmbeddingService]
        SVC_LLM[LLMClient]
        SVC_Speech[SpeechService]
    end

    subgraph Data["Data Layer"]
        Adapter[SeekDbAdapter]
        Client[seekdb-rs Client]
        DB[(Embedded SeekDB)]
        Tables[Relational Tables]
        VectorColl[Vector Collection + HNSW]
    end

    subgraph External["External Services"]
        DashScope[Aliyun Bailian API<br/>Embedding + LLM]
    end

    UI --> Command
    State --> Command
    CMD_Project --> SVC_Project
    CMD_Doc --> SVC_Doc
    CMD_Chat --> SVC_Conv
    CMD_Speech --> SVC_Speech

    SVC_Doc --> SVC_Embed
    SVC_Conv --> SVC_LLM
    SVC_Project --> Adapter
    SVC_Doc --> Adapter
    SVC_Conv --> Adapter

    Adapter --> Client
    Client --> DB
    DB --> Tables
    DB --> VectorColl

    SVC_Embed --> DashScope
    SVC_LLM --> DashScope

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Result