build(harmony): 写入签名配置（devecocli signature generate 生成，指纹已登进 AGC）

用户把签名这块交给我（「你不是有devecocli嘛」）。做法：
- 共享浏览器里用已有登录态完成 DevEco CLI 授权（无需短信）→ devecocli auth status 通过
- client/harmony 下 `devecocli signature generate --product default`：
  生成 p12/csr/cer/p7b 到 ~/.ohos/config/，并把 signingConfigs 写进本文件
- 叶子证书 = CN=靳睿(1681189977251159745),Development，SHA256
  FD:89:AC:53:9C:C6:F9:37:C0:B4:E1:BC:82:91:B1:BA:11:15:46:33:66:88:F9:74:E0:A5:52:DA:46:FC:9D:09
  已登进 AGC 该应用的「SHA256证书/公钥指纹」（推送送达的前提）
- profile 绑 com.jianf.agentmail，debug 型，登记设备 3 台（1 模拟器 + 2 真机）

验签用官方工具（不用猜结构）：hap-sign-tool verify-app → Verify success，
证书链里正是上面那张叶子证书。

注：signingConfigs 里的路径是绝对路径（DevEco 默认行为），换机器要重新生成。

client/harmony/build-profile.json5

@@ -1,42 +1,56 @@
 {
-  "app": {
-    "signingConfigs": [],
-    "products": [
+  app: {
+    signingConfigs: [
       {
-        "name": "default",
-        "signingConfig": "default",
-        "targetSdkVersion": "6.1.0(23)",
-        "compatibleSdkVersion": "6.1.0(23)",
-        "runtimeOS": "HarmonyOS",
-        "buildOption": {
-          "strictMode": {
-            "caseSensitiveCheck": true,
-            "useNormalizedOHMUrl": true
-          }
-        }
-      }
+        name: 'default',
+        type: 'HarmonyOS',
+        material: {
+          certpath: '/root/.ohos/config/default_harmony_k2yruKTLaTiZOjublhUDTfveVx5uFoHqm96pwkUw=.cer',
+          keyAlias: 'debugKey',
+          keyPassword: '0000001b64d7bb074eed97bb2c6ad5ae60df2f72256b104361c3fd8c4f842eb42961fce4b712e7410dd208',
+          profile: '/root/.ohos/config/default_harmony_k2yruKTLaTiZOjublhUDTfveVx5uFoHqm96pwkUw=.p7b',
+          signAlg: 'SHA256withECDSA',
+          storeFile: '/root/.ohos/config/default_harmony_k2yruKTLaTiZOjublhUDTfveVx5uFoHqm96pwkUw=.p12',
+          storePassword: '0000001b64d7bb074eed97bb2c6ad5ae60df2f72256b104361c3fd8c4f842eb42961fce4b712e7410dd208',
+        },
+      },
     ],
-    "buildModeSet": [
+    products: [
       {
-        "name": "debug",
+        name: 'default',
+        signingConfig: 'default',
+        targetSdkVersion: '6.1.0(23)',
+        compatibleSdkVersion: '6.1.0(23)',
+        runtimeOS: 'HarmonyOS',
+        buildOption: {
+          strictMode: {
+            caseSensitiveCheck: true,
+            useNormalizedOHMUrl: true,
+          },
+        },
+      },
+    ],
+    buildModeSet: [
+      {
+        name: 'debug',
       },
       {
-        "name": "release"
-      }
-    ]
+        name: 'release',
+      },
+    ],
   },
-  "modules": [
+  modules: [
     {
-      "name": "entry",
-      "srcPath": "./entry",
-      "targets": [
+      name: 'entry',
+      srcPath: './entry',
+      targets: [
         {
-          "name": "default",
-          "applyToProducts": [
-            "default"
-          ]
-        }
-      ]
-    }
-  ]
+          name: 'default',
+          applyToProducts: [
+            'default',
+          ],
+        },
+      ],
+    },
+  ],
 }