refactor!: rename the project from Monitor to MoShiro [CI]

Namespaces, assemblies, solution, binaries, images, systemd units, config paths, environment variables, protocol methods and the Linux user are all renamed. Breaking: existing databases, node identities and installed units must be recreated.

backend/probe/src/MoShiro.Probe/ProbeConfig.cs

@@ -0,0 +1,65 @@
+using System.Text.Json.Serialization;
+
+namespace MoShiro.Probe;
+
+/// <summary>
+/// <c>probe.json</c>：面板 <c>POST /api/admin/probe/identity</c> 生成的文件（只能下载一次）。
+/// <c>limits</c> 是本地硬上限，面板无法修改；在路由器上建议调低，避免 Probe 自己的 CPU 成为瓶颈、反过来影响测量。
+/// </summary>
+public sealed class ProbeFile
+{
+    [JsonPropertyName("probe_id")]
+    public string ProbeId { get; set; } = "";
+
+    /// <summary>PKCS#8，base64。</summary>
+    [JsonPropertyName("private_key")]
+    public string PrivateKey { get; set; } = "";
+
+    /// <summary>面板的地址（http 或 https）。Probe 直接连它：身份、Agent 列表、更新都从这里来。</summary>
+    [JsonPropertyName("server")]
+    public string Server { get; set; } = "";
+
+    [JsonPropertyName("limits")]
+    public ProbeLimits Limits { get; set; } = new();
+}
+
+public sealed class KnownAgent
+{
+    [JsonPropertyName("agent_id")]
+    public string AgentId { get; set; } = "";
+
+    [JsonPropertyName("host")]
+    public string Host { get; set; } = "";
+
+    [JsonPropertyName("tcp_port")]
+    public int TcpPort { get; set; }
+
+    /// <summary>Agent 的 TLS 证书指纹（SHA-256，base64）。</summary>
+    [JsonPropertyName("spki")]
+    public string Spki { get; set; } = "";
+}
+
+public sealed class ProbeLimits
+{
+    /// <summary>按需测试里单个阶段允许的最大码率（Mbit/s）。</summary>
+    [JsonPropertyName("max_test_mbps")]
+    public double MaxTestMbps { get; set; } = 100;
+
+    /// <summary>按需测试里单个阶段允许的最大包速率。</summary>
+    [JsonPropertyName("max_total_pps")]
+    public long MaxTotalPps { get; set; } = 20_000;
+}
+
+[JsonSerializable(typeof(ProbeFile))]
+[JsonSerializable(typeof(AgentsCache))]
+public sealed partial class ProbeConfigContext : JsonSerializerContext;
+
+/// <summary><c>agents.json</c>：最近一次从面板同步到的 Agent 列表（配置，不是测量数据）；面板连不上时 Probe 靠它继续测量。</summary>
+public sealed class AgentsCache
+{
+    [JsonPropertyName("version")]
+    public long Version { get; set; }
+
+    [JsonPropertyName("agents")]
+    public List<KnownAgent> Agents { get; set; } = [];
+}