feat: improve build and serialization logic

- Update v fmt exit code handling
- Support dynamic organization for symlinks
- Add f32 and list f64 serialization/deserialization
- Improve JSON decoding for bid requirements/pricing
- Add basic tests for Bid and Node creation

lib/threefold/models_tfgrid/models_tfgrid_test.v

@@ -0,0 +1,39 @@
+module models_tfgrid
+
+fn test_bid_creation() {
+	// Just a simple test to verify the module compiles
+	bid := Bid{
+		customer_id:    123
+		requirements:   {
+			'compute_nodes': '10'
+		}
+		pricing:        {
+			'compute_nodes': '10.2'
+		}
+		status:         .pending
+		obligation:     true
+		start_date:     1234567890
+		end_date:       1234567890
+		signature_user: 'test_signature'
+		billing_period: .monthly
+	}
+
+	assert bid.customer_id == 123
+	assert bid.status == .pending
+}
+
+fn test_node_creation() {
+	// Just a simple test to verify the module compiles
+	node := Node{
+		nodegroupid:      456
+		country:          'US'
+		uptime:           99
+		pubkey:           'test_pubkey'
+		signature_node:   'test_sig_node'
+		signature_farmer: 'test_sig_farmer'
+	}
+
+	assert node.nodegroupid == 456
+	assert node.country == 'US'
+	assert node.uptime == 99
+}