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)

Cargo.lock

@@ -1196,7 +1196,9 @@ dependencies = [
  "arboard",
  "axum",
  "clap",
+ "libc",
  "notify",
+ "open",
  "reqwest",
  "rusqlite",
  "rust-embed",
@@ -1259,6 +1261,25 @@ version = "2.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d98f6fed1fde3f8c21bc40a1abb88dd75e67924f9cffc3ef95607bad8017f8e2"
 
+[[package]]
+name = "is-docker"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "928bae27f42bc99b60d9ac7334e3a21d10ad8f1835a4e12ec3ec0464765ed1b3"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "is-wsl"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "173609498df190136aa7dea1a91db051746d339e18476eed5ca40521f02d7aa5"
+dependencies = [
+ "is-docker",
+ "once_cell",
+]
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.2"
@@ -1755,6 +1776,17 @@ version = "1.70.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"
 
+[[package]]
+name = "open"
+version = "5.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fbaa89d2ddc8473c78a3adf69eea8cffa28c483b8e02a971ef31527cd0fc92c"
+dependencies = [
+ "is-wsl",
+ "libc",
+ "pathdiff",
+]
+
 [[package]]
 name = "option-ext"
 version = "0.2.0"
@@ -1809,6 +1841,12 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "pathdiff"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df94ce210e5bc13cb6651479fa48d14f601d9858cfe0467f43ae157023b938d3"
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.2"
@@ -1988,7 +2026,7 @@ dependencies = [
  "once_cell",
  "socket2",
  "tracing",
- "windows-sys 0.52.0",
+ "windows-sys 0.60.2",
 ]
 
 [[package]]