align samples with v1alpha1 design and system limits

config/samples/external-etcd.yaml

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+apiVersion: multigres.com/v1alpha1
+kind: MultigresCluster
+metadata:
+  name: external-etcd-cluster
+  namespace: default
+spec:
+  # ----------------------------------------------------------------
+  # 1. Global Topology (External)
+  # ----------------------------------------------------------------
+  # Connects to an existing, external Etcd cluster (e.g. cloud managed).
+  globalTopoServer:
+    external:
+      endpoints:
+        - "https://etcd-1.infra.local:2379"
+        - "https://etcd-2.infra.local:2379"
+      caSecret: "etcd-ca-secret"
+      clientCertSecret: "etcd-client-cert-secret"
+      rootPath: "/multigres/global"
+
+  # ----------------------------------------------------------------
+  # 2. Cell Definitions (Mixed Mode)
+  # ----------------------------------------------------------------
+  cells:
+    # Cell A: Standard Configuration
+    # Uses the Global External Etcd defined above.
+    - name: "zone-a"
+      zone: "us-east-1a"
+
+    # Cell B: High-Isolation Configuration
+    # This cell has its own dedicated, Operator-managed Etcd cluster.
+    # It does NOT use the global etcd for cell-level data.
+    # Benefit: If the external global etcd has an outage, this cell
+    # remains fully functional for intra-cell traffic.
+    - name: "zone-b-isolated"
+      zone: "us-east-1b"
+      spec:
+        localTopoServer:
+          etcd:
+            image: "quay.io/coreos/etcd:v3.5"
+            replicas: 3
+            storage:
+              size: "5Gi"
+              class: "standard-gp3"
+        # Since we are defining 'spec', we must also define the gateway
+        multigateway:
+           replicas: 2

config/samples/minimal.yaml

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+apiVersion: multigres.com/v1alpha1
+kind: MultigresCluster
+metadata:
+  name: minimal-cluster
+  namespace: default
+spec:
+  # A minimal cluster requires at least one cell definition.
+  #
+  # The operator will resolve configuration defaults in this order:
+  # 1. Namespace Defaults: If a template named "default" exists in this namespace
+  #    (e.g., CoreTemplate/default, CellTemplate/default), it will be used.
+  # 2. Hardcoded Defaults: If no template is found, the operator injects:
+  #    - Default GlobalTopoServer (Managed Etcd, 3 replicas)
+  #    - Default MultiAdmin (1 replica)
+  #    - Default Database ("postgres") with Default TableGroup ("default")
+  cells:
+    - name: "zone-a"
+      zone: "us-east-1a"

config/samples/no-templates.yaml

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+apiVersion: multigres.com/v1alpha1
+kind: MultigresCluster
+metadata:
+  name: advanced-cluster
+  namespace: default
+spec:
+  # ----------------------------------------------------------------
+  # 1. Global Components (Inline)
+  # ----------------------------------------------------------------
+  globalTopoServer:
+    etcd:
+      image: "quay.io/coreos/etcd:v3.5"
+      replicas: 3
+      storage:
+        size: "10Gi"
+        class: "standard-gp3"
+      resources:
+        requests:
+          cpu: "500m"
+          memory: "1Gi"
+        limits:
+          cpu: "1"
+          memory: "2Gi"
+
+  multiadmin:
+    spec:
+      replicas: 2
+      resources:
+        requests:
+          cpu: "200m"
+          memory: "256Mi"
+        limits:
+          cpu: "500m"
+          memory: "512Mi"
+
+  # ----------------------------------------------------------------
+  # 2. Cell Definitions (Inline)
+  # ----------------------------------------------------------------
+  cells:
+    - name: "us-east-1a"
+      zone: "us-east-1a"
+      spec:
+         multigateway:
+           replicas: 2
+           resources:
+             requests:
+               cpu: "1"
+               memory: "2Gi"
+             limits:
+               cpu: "2"
+               memory: "4Gi"
+
+  # ----------------------------------------------------------------
+  # 3. Database Topology (Inline)
+  # ----------------------------------------------------------------
+  databases:
+    - name: "postgres"
+      default: true
+      tablegroups:
+        - name: "default" # Gateway requires this name at the moment.
+          default: true
+          shards:
+            - name: "0"
+              spec:
+                multiorch:
+                  cells:
+                    - "us-east-1a"
+                  resources:
+                    requests:
+                      cpu: "200m"
+                      memory: "256Mi"
+                    limits:
+                      cpu: "500m"
+                      memory: "512Mi"
+
+                pools:
+                  main-app:
+                    type: "readWrite"
+                    cells:
+                      - "us-east-1a"
+                    replicasPerCell: 2
+                    storage:
+                      class: "gp3"
+                      size: "100Gi"
+                    postgres:
+                       resources:
+                          requests:
+                            cpu: "2"
+                            memory: "4Gi"
+                          limits:
+                            cpu: "4"
+                            memory: "8Gi"
+                    multipooler:
+                       resources:
+                          requests:
+                            cpu: "500m"
+                            memory: "1Gi"
+                          limits:
+                            cpu: "1"
+                            memory: "2Gi"