Add tests for main package, manager, and various components

- Introduced unit tests for the main package to ensure compilation.
- Added tests for the manager, including validation of upload sessions and handling of Blender binary paths.
- Implemented tests for job token generation and validation, ensuring security and integrity.
- Created tests for configuration management and database schema to verify functionality.
- Added tests for logger and runner components to enhance overall test coverage and reliability.

internal/runner/tasks/render_test.go

@@ -0,0 +1,28 @@
+package tasks
+
+import "testing"
+
+func TestCheckGPUErrorLine_TriggersCallback(t *testing.T) {
+	p := NewRenderProcessor()
+	triggered := false
+	ctx := &Context{
+		OnGPUError: func() { triggered = true },
+	}
+	p.checkGPUErrorLine(ctx, "Fatal: Illegal address in HIP kernel execution")
+	if !triggered {
+		t.Fatal("expected GPU error callback to be triggered")
+	}
+}
+
+func TestCheckGPUErrorLine_IgnoresNormalLine(t *testing.T) {
+	p := NewRenderProcessor()
+	triggered := false
+	ctx := &Context{
+		OnGPUError: func() { triggered = true },
+	}
+	p.checkGPUErrorLine(ctx, "Render completed successfully")
+	if triggered {
+		t.Fatal("did not expect GPU callback for normal line")
+	}
+}
+