feat: Phase 7 — CLI complet (start/serve/stop/status/config/logs)

- Gestion PID (write/read/remove + verification processus)
- cmd_start: lance watcher + dashboard avec Ctrl+C graceful shutdown
- cmd_serve: dashboard seul (Linux) avec --no-watcher
- cmd_stop: kill processus via SIGTERM/OpenProcess + nettoyage PID
- cmd_status: affiche PID, dashboard URL, config, polling
- cmd_config show/set/reset: gestion dotted keys (imago.url, watcher.*, etc.)
- cmd_logs: affiche derniers logs
- Fix Default derives: ImagoConfig, DedupConfig, UiConfig, LoggingConfig
- Ajout dependances: open, libc (Unix)
- Watcher::run(self) au lieu de &self pour Send
- tests: start → API /api/health OK → stop → status OK
- 0 errors, 0 warnings (cargo check + cargo build --release)

src/config.rs

@@ -72,7 +72,7 @@ fn default_exclude_apps() -> Vec<String> {
     vec!["mstsc".into()]
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct DedupConfig {
     #[serde(default = "default_dedup_method")]
     pub method: String,
@@ -80,6 +80,15 @@ pub struct DedupConfig {
     pub cache_size: usize,
 }
 
+impl Default for DedupConfig {
+    fn default() -> Self {
+        Self {
+            method: default_dedup_method(),
+            cache_size: default_cache_size(),
+        }
+    }
+}
+
 fn default_dedup_method() -> String {
     "sha256".into()
 }
@@ -88,7 +97,7 @@ fn default_cache_size() -> usize {
     10000
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct UiConfig {
     #[serde(default = "default_true")]
     pub show_notifications: bool,
@@ -98,16 +107,34 @@ pub struct UiConfig {
     pub notification_timeout_sec: u64,
 }
 
+impl Default for UiConfig {
+    fn default() -> Self {
+        Self {
+            show_notifications: true,
+            show_tray_icon: true,
+            notification_timeout_sec: default_notification_timeout(),
+        }
+    }
+}
+
 fn default_notification_timeout() -> u64 {
     3
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct LoggingConfig {
     #[serde(default = "default_log_level")]
     pub level: String,
 }
 
+impl Default for LoggingConfig {
+    fn default() -> Self {
+        Self {
+            level: default_log_level(),
+        }
+    }
+}
+
 fn default_log_level() -> String {
     "info".into()
 }