fix(mcp): show Installed state for catalog entries already installed (#1405)

app/src/test/java/com/m57/hermescontrol/data/model/McpServerParsingTest.kt

@@ -0,0 +1,37 @@
+package com.m57.hermescontrol.data.model
+
+import kotlinx.serialization.json.Json
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class McpServerParsingTest {
+    private val json = Json { ignoreUnknownKeys = true }
+
+    @Test
+    fun `servers decode tools as null, list, or filter object`() {
+        val body =
+            """{"servers":[
+              {"name":"a","enabled":true,"tools":null},
+              {"name":"b","enabled":true,"tools":["x","y"]},
+              {"name":"c","enabled":true,"tools":{"exclude":["docs","*_radar*"]}},
+              {"name":"d","enabled":true,"tools":{"include":["one","two","three"]}}
+            ]}"""
+        val servers = json.decodeFromString<McpServersResponse>(body).servers
+        assertEquals(listOf<Int?>(null, 2, null, 3), servers.map { it.toolCount })
+    }
+
+    @Test
+    fun `catalog entry decodes backend required_env and installed flags`() {
+        val body =
+            """{"entries":[{"name":"gh","description":"d","source":"nous","transport":"stdio",
+              "required_env":[{"name":"GH_TOKEN","prompt":"Token","required":true}],
+              "installed":true,"enabled":false,"needs_install":false}],"diagnostics":[]}"""
+        val entry = json.decodeFromString<McpCatalogResponse>(body).entries.single()
+        assertTrue(entry.installed)
+        assertEquals("GH_TOKEN", entry.env?.single()?.key)
+        assertEquals("Token", entry.env?.single()?.label)
+        assertNull(entry.url)
+    }
+}