refactor: move transforms/ into infrahub/ and update all paths (#20)

Move transforms/{queries,templates,tests} under infrahub/transforms/ so all
Infrahub-managed content lives under the dedicated infrahub/ directory,
consistent with schemas/, objects/, and menus/.

Updated paths:
- .infrahub.yml: file_path and template_path entries now prefixed with
  infrahub/transforms/
- infrahub/transforms/tests/*/test.yml: directory references updated from
  transforms/tests/* to infrahub/transforms/tests/*

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

infrahub/transforms/tests/vxlan_yang/input.json

@@ -0,0 +1,62 @@
+{
+  "data": {
+    "InfraVTEP": {
+      "edges": [
+        {
+          "node": {
+            "source_address": {
+              "value": "10.0.255.11/32"
+            },
+            "udp_port": {
+              "value": 4789
+            },
+            "learn_restrict": {
+              "value": "any"
+            },
+            "source_interface": {
+              "node": {
+                "name": {
+                  "value": "Loopback1"
+                }
+              }
+            },
+            "vlan_vni_mappings": {
+              "edges": [
+                {
+                  "node": {
+                    "description": {
+                      "value": "VLAN 40 <-> VNI 110040"
+                    },
+                    "vlan": {
+                      "node": {
+                        "vlan_id": {
+                          "value": 40
+                        },
+                        "name": {
+                          "value": "test-l2-vxlan"
+                        }
+                      }
+                    },
+                    "vni": {
+                      "node": {
+                        "vni": {
+                          "value": 110040
+                        },
+                        "vni_type": {
+                          "value": "l2vni"
+                        }
+                      }
+                    }
+                  }
+                }
+              ]
+            }
+          }
+        }
+      ]
+    },
+    "InfraVRFDeviceAssignment": {
+      "edges": []
+    }
+  }
+}

infrahub/transforms/tests/vxlan_yang/output.json

@@ -0,0 +1,12 @@
+{
+  "vtep": {
+    "learn_restrict": "any",
+    "source_address": "10.0.255.11/32",
+    "source_interface": "Loopback1",
+    "udp_port": 4789,
+    "vlan_vni_mappings": [
+      {"vlan_id": 40, "vlan_name": "test-l2-vxlan", "vni": 110040, "vni_type": "l2vni"}
+    ],
+    "vrf_vni_mappings": []
+  }
+}

infrahub/transforms/tests/vxlan_yang/test.yml

@@ -0,0 +1,15 @@
+---
+version: "1.0"
+infrahub_tests:
+  - resource: Jinja2Transform
+    resource_name: vxlan_yang_transform
+    tests:
+      - name: smoke_check
+        spec:
+          kind: jinja2-transform-smoke
+      - name: render_leaf1
+        spec:
+          kind: jinja2-transform-unit-render
+          directory: infrahub/transforms/tests/vxlan_yang
+          input: input.json
+          output: output.json