rm-hull / dot-block / 20506777792

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feat: add apple `.mobileconfig` generation endpoint (#49)

* feat: add apple .mobileconfig generation endpoint

Provides a new endpoint at `/.mobileconfig` that serves an Apple
configuration profile for system-wide Encrypted DNS (DoT). This
simplifies the setup process for iOS and macOS devices.

*   Added `howett.net/plist` dependency for XML plist encoding.
*   Defined Go structs for `Profile`, `DNSSpec`, and `DNSBlock` to
    match Apple's configuration specifications.
*   Implemented a handler that generates the profile with hardcoded
    metadata and a specific `PayloadUUID`.
*   Registered the route in the `gin` router.

```mermaid
sequenceDiagram
    participant Client as Apple Device
    participant App as dot-block Server
    participant MC as mobileconfig Handler

    Client->>App: GET /.mobileconfig
    App->>MC: Generate Profile
    MC->>MC: Encode Profile to Plist XML
    MC-->>App: Binary Plist Data
    App-->>Client: 200 OK (application/x-apple-aspen-config)
    Note over Client: User prompted to install DNS profile
```

* Unique payload-uuids

* Bump version

* feat: enhance mobileconfig for system-wide DNS

Updated the `mobileconfig` implementation to support system-wide DNS
deployment and on-demand connection rules:

- Added `PayloadScope`, `ServerName`, and `OnDemandRules` to models.
- Configured the profile to use **System** scope.
- Updated `DNSSettings` to use explicit IP addresses and `ServerName`.
- Renamed the output file to `dot-block.mobileconfig`.
- Refined payload identifiers for better consistency.

```mermaid
classDiagram
    class Profile {
        +String PayloadScope
        +[]DNSSpec PayloadContent
    }
    class DNSSpec {
        +DNSBlock DNSSettings
        +[]OnDemandRule OnDemandRules
    }
    class DNSBlock {
        +String ServerName
        +[]String ServerAddresses
    }
    Profile *-- DNSSpec
    DNSSpec *-- DNSBlock
    DNSSpec *-- OnDemandRule
```

* feat: resolve mobileconfig IPs dynamically

Update... (continued)

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