initial commit

backend/Domain/Enums/ConnectionType.cs

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+namespace Extrudex.Domain.Enums;
+
+/// <summary>
+/// Describes how the backend communicates with a printer.
+/// </summary>
+public enum ConnectionType
+{
+    /// <summary>Bambu Lab printers communicating via MQTT over TLS.</summary>
+    Mqtt = 0,
+
+    /// <summary>Klipper-based printers (Elegoo) communicating via Moonraker REST/WebSocket.</summary>
+    Moonraker = 1
+}

backend/Domain/Enums/DataSource.cs

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+namespace Extrudex.Domain.Enums;
+
+/// <summary>
+/// Indicates where the print job data originated from.
+/// </summary>
+public enum DataSource
+{
+    /// <summary>Data reported by a Bambu Lab printer via MQTT.</summary>
+    Mqtt = 0,
+
+    /// <summary>Data reported by an Elegoo/Klipper printer via Moonraker.</summary>
+    Moonraker = 1,
+
+    /// <summary>Manually entered by a user.</summary>
+    Manual = 2
+}

backend/Domain/Enums/JobStatus.cs

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+namespace Extrudex.Domain.Enums;
+
+/// <summary>
+/// Represents the current lifecycle status of a print job.
+/// </summary>
+public enum JobStatus
+{
+    /// <summary>Job has been created but not yet sent to the printer.</summary>
+    Queued = 0,
+
+    /// <summary>Printer is actively printing this job.</summary>
+    Printing = 1,
+
+    /// <summary>Job completed successfully.</summary>
+    Completed = 2,
+
+    /// <summary>Job was cancelled by the user.</summary>
+    Cancelled = 3,
+
+    /// <summary>Job failed due to an error.</summary>
+    Failed = 4
+}

backend/Domain/Enums/PrinterStatus.cs

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+namespace Extrudex.Domain.Enums;
+
+/// <summary>
+/// Represents the current operational status of a printer.
+/// </summary>
+public enum PrinterStatus
+{
+    /// <summary>
+    /// Printer is online and idle, ready to accept jobs.
+    /// </summary>
+    Idle = 0,
+
+    /// <summary>
+    /// Printer is currently printing.
+    /// </summary>
+    Printing = 1,
+
+    /// <summary>
+    /// Printer is offline or unreachable.
+    /// </summary>
+    Offline = 2,
+
+    /// <summary>
+    /// Printer is in an error state.
+    /// </summary>
+    Error = 3,
+
+    /// <summary>
+    /// Printer is paused.
+    /// </summary>
+    Paused = 4
+}

backend/Domain/Enums/PrinterType.cs

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+namespace Extrudex.Domain.Enums;
+
+/// <summary>
+/// Identifies the type of 3D printer hardware.
+/// </summary>
+public enum PrinterType
+{
+    /// <summary>FDM/FFF filament-based printer.</summary>
+    Fdm = 0,
+
+    /// <summary>Resin-based SLA/DLP/LCD printer.</summary>
+    Resin = 1
+}

backend/Domain/Enums/QrResourceType.cs

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+namespace Extrudex.Domain.Enums;
+
+/// <summary>
+/// Defines the resource types that support QR code generation.
+/// Each type maps to a distinct API route for QR code retrieval.
+/// </summary>
+public enum QrResourceType
+{
+    /// <summary>
+    /// QR code for a filament spool — links to spool detail/scan view.
+    /// </summary>
+    Spool,
+
+    /// <summary>
+    /// QR code for a printer — links to printer detail/monitor view.
+    /// </summary>
+    Printer,
+
+    /// <summary>
+    /// QR code for a storage location — links to location inventory view.
+    /// Reserved for future use when Location entities are introduced.
+    /// </summary>
+    Location
+}