Sync état à jour + fix perf GPU/CPU

- LD_LIBRARY_PATH inclut désormais les dossiers runtime CUDA
  (/usr/local/cuda*/lib64) : corrige le chargement du backend GPU.
- Unit systemd : Nice=-10 + CPUSchedulingPolicy=other (priorité CPU).
- Met à niveau le reste du projet (models, webauth, presets, web UI).

platform_unix.go

@@ -6,6 +6,9 @@ import (
 	"context"
 	"os"
 	"os/exec"
+	"path/filepath"
+	"sort"
+	"strings"
 	"syscall"
 )
 
@@ -17,13 +20,41 @@ func defaultJeanHome() string { return "/etc/jean" }
 func defaultEditor() string { return "nano" }
 
 // setLibraryPath ensures llama-server can load shared libs bundled next to the
-// binary by prepending dir to LD_LIBRARY_PATH.
+// binary by prepending dir to LD_LIBRARY_PATH. It also appends the CUDA runtime
+// lib directories: a CUDA-enabled build links against libcudart/libcublas, which
+// live under /usr/local/cuda*/lib64 and are often absent from the global ld
+// cache — without them llama-server fails to load the GPU backend (or runs
+// degraded), costing a large chunk of throughput.
 func setLibraryPath(dir string) {
-	ld := dir
+	parts := []string{dir}
+	parts = append(parts, cudaLibDirs()...)
 	if existing := os.Getenv("LD_LIBRARY_PATH"); existing != "" {
-		ld = ld + ":" + existing
+		parts = append(parts, existing)
 	}
-	_ = os.Setenv("LD_LIBRARY_PATH", ld)
+	_ = os.Setenv("LD_LIBRARY_PATH", strings.Join(parts, ":"))
+}
+
+// cudaLibDirs returns the CUDA runtime lib directories present on the machine,
+// preferring the highest-versioned install. Empty when no CUDA toolkit is found.
+func cudaLibDirs() []string {
+	var dirs []string
+	seen := map[string]bool{}
+	add := func(d string) {
+		if d != "" && !seen[d] && isDir(d) {
+			seen[d] = true
+			dirs = append(dirs, d)
+		}
+	}
+	// Default symlink first (usually points at the active toolkit).
+	add("/usr/local/cuda/lib64")
+	add("/usr/local/cuda/targets/x86_64-linux/lib")
+	// Versioned installs, newest last so it takes precedence in PATH order.
+	versioned, _ := filepath.Glob("/usr/local/cuda-*/lib64")
+	sort.Strings(versioned)
+	for i := len(versioned) - 1; i >= 0; i-- {
+		add(versioned[i])
+	}
+	return dirs
 }
 
 // execServer replaces the current process with llama-server (so systemd