fix(azure): fix PostgreSQL SKU format and ACR login resource group

- infra.bicep: correct SKU format from B_Standard_B1ms to Standard_B1ms
  (Azure Flexible Server uses Standard_* prefix, not B_*); update tier
  detection logic accordingly (contains '_B' -> Burstable)
- 2-build-deploy.sh: add --resource-group to az acr login to avoid
  accidentally matching an ACR with the same name in a different RG
- config.sh.example: update POSTGRES_SKU default to Standard_B1ms

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

azure/2-build-deploy.sh

@@ -93,7 +93,7 @@ echo ""
 
 # ── Login a l'ACR ─────────────────────────────────────────────────────────────
 echo "→ Login a l'ACR..."
-az acr login --name "$ACR_NAME"
+az acr login --name "$ACR_NAME" --resource-group "$RESOURCE_GROUP"
 
 # ── Build de la imatge Docker ─────────────────────────────────────────────────
 echo "→ Build de la imatge Docker..."

azure/config.sh.example

@@ -78,8 +78,8 @@ POSTGRES_ADMIN_PASSWORD="<contrasenya-segura-postgres>"
 # Usuari administrador de PostgreSQL (per defecte: mirofish)
 POSTGRES_ADMIN_USER="mirofish"
 
-# SKU de PostgreSQL: B_Standard_B1ms (dev/test) | GP_Standard_D2s_v3 (producció)
-POSTGRES_SKU="B_Standard_B1ms"
+# SKU de PostgreSQL: Standard_B1ms (dev/test) | Standard_D2s_v3 (producció)
+POSTGRES_SKU="Standard_B1ms"
 
 # ── Storage ───────────────────────────────────────────────────────────────────
 # Opció A — Compte existent (ex: stgraphiti16852 que ja té caddydata, neo4jdata)

azure/infra.bicep

@@ -23,8 +23,8 @@ param postgresAdminPassword string
 @description('Usuari administrador de PostgreSQL')
 param postgresAdminUser string = 'mirofish'
 
-@description('SKU de PostgreSQL (B_Standard_B1ms per dev; GP_Standard_D2s_v3 per pro)')
-param postgresSku string = 'B_Standard_B1ms'
+@description('SKU de PostgreSQL (Standard_B1ms per dev; Standard_D2s_v3 per pro)')
+param postgresSku string = 'Standard_B1ms'
 
 @description('Nom del Storage Account existent (o buit per crear-ne un de nou: <projectName>store)')
 param storageAccountName string = ''
@@ -102,7 +102,7 @@ resource postgresServer 'Microsoft.DBforPostgreSQL/flexibleServers@2023-06-01-pr
   location: location
   sku: {
     name: postgresSku
-    tier: startsWith(postgresSku, 'B_') ? 'Burstable' : 'GeneralPurpose'
+    tier: contains(postgresSku, '_B') ? 'Burstable' : (contains(postgresSku, '_D') || contains(postgresSku, '_E') ? 'GeneralPurpose' : 'MemoryOptimized')
   }
   properties: {
     administratorLogin: postgresAdminUser