wip: config overhaul

[yaugenst-flex]

graph TB
    %% Subtle, modern palette
    classDef api fill:#e0e7ff,stroke:#6366f1,stroke-width:2px,color:#312e81
    classDef core fill:#d1fae5,stroke:#34d399,stroke-width:2px,color:#064e3b
    classDef data fill:#fed7aa,stroke:#fb923c,stroke-width:2px,color:#7c2d12
    classDef ext fill:#e5e7eb,stroke:#9ca3af,stroke-width:2px,color:#374151
    classDef validate fill:#fecaca,stroke:#f87171,stroke-width:2px,color:#7f1d1d

    User((User))
    
    subgraph API["API Layer"]
        Legacy[Legacy Wrapper]:::api
        Config[Tidy3DConfig]:::api
        Proxies[Proxy Layer]:::api
    end
    
    subgraph Core["Core Layer"]
        Factory["Factory<br/>Validates all changes"]:::validate
        Service[Service<br/>Side Effects]:::core
        Repository[Repository<br/>Persistence]:::core
    end
    
    subgraph Data["Data Layer (Immutable)"]
        Sections["Config Sections<br/>(Pydantic Models)"]:::data
        State["Runtime State<br/>(Immutable)"]:::data
    end
    
    subgraph External["External"]
        direction TB
        Dynaconf[Dynaconf]:::ext
        Sources["TOML Files<br/>+<br/>Environment Variables"]:::ext
    end
    
    %% User access
    User -->|"td.config.x.y"| Legacy
    Legacy -->|"wraps"| Config
    
    %% Read path
    Config -->|"access"| Proxies
    Proxies -->|"get"| Factory
    Factory -->|"load"| State
    
    %% Write path
    Proxies -.->|"set"| Factory
    Factory ==>|"validate &<br/>create new"| Sections
    Sections ==>|"immutable<br/>update"| State
    
    %% Side effects
    Factory -->|"notify"| Service
    Service -->|"apply"| State
    
    %% Persistence
    Config -->|"save()"| Repository
    Repository --> Dynaconf
    Dynaconf --> Sources
    
    %% Initialization
    Sources -.->|"startup"| Dynaconf
    Dynaconf -.->|"load"| Repository
    Repository -.->|"init"| State

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