fix(fnm): load managed Node from always-on zsh layer

fnm lived in interactive-only ~/.config/zshrc, so ssh/agents/zsh -c
missed fnm-managed node. Source ~/.config/zsh/*.zsh from .zshenv and
install the fragment as zsh/fnm instead.

patch.sh

@@ -2,31 +2,47 @@
 
 set -euo pipefail
 
-BASE_URL="https://git.miomio.moe/mio/easyzsh/raw/branch/master/zshrc"
+# Install tool fragments from this repo into ~/.config.
+#
+# Bare name  → zshrc/<name>.zsh  → ~/.config/zshrc/<name>.zsh  (interactive)
+# Path form  → <path>.zsh        → ~/.config/<path>.zsh
+#              e.g. zsh/fnm      → ~/.config/zsh/fnm.zsh         (always-on)
 
-ZSH_CONFIGS_DIR="$HOME/.config/zshrc"
-mkdir -p "$ZSH_CONFIGS_DIR"
+BASE_URL="https://git.miomio.moe/mio/easyzsh/raw/branch/master"
 
-if [ "$#" -gt 0 ]; then
-    for arg in "$@"; do
+if [ "$#" -eq 0 ]; then
+    echo "No arguments provided. Please specify the config files to download."
+    exit 1
+fi
+
+for arg in "$@"; do
+    if [[ "$arg" == */* ]]; then
+        # Path form: one or more simple segments (zsh/fnm).
+        if [[ "$arg" == *..* || "$arg" == /* || ! "$arg" =~ ^[A-Za-z0-9_-]+(/[A-Za-z0-9_-]+)+$ ]]; then
+            echo "Invalid config path: $arg" >&2
+            exit 1
+        fi
+        rel="${arg}.zsh"
+        destination="$HOME/.config/${arg}.zsh"
+    else
         if [[ -z "$arg" || "$arg" == *[![:alnum:]_-]* ]]; then
             echo "Invalid config name: $arg" >&2
             exit 1
         fi
+        rel="zshrc/${arg}.zsh"
+        destination="$HOME/.config/zshrc/${arg}.zsh"
+    fi
 
-        destination="${ZSH_CONFIGS_DIR}/${arg}.zsh"
-        temporary=$(mktemp "$HOME/.config/.easyzsh-${arg}.XXXXXX")
-        trap 'rm -f "$temporary"' EXIT
+    mkdir -p "$(dirname "$destination")"
+    temporary=$(mktemp "$HOME/.config/.easyzsh-XXXXXX")
+    trap 'rm -f "$temporary"' EXIT
 
-        if ! curl -fsSL "${BASE_URL}/${arg}.zsh" -o "$temporary"; then
-            echo "Failed to download ${arg}.zsh from ${BASE_URL}"
-            exit 1
-        fi
+    if ! curl -fsSL "${BASE_URL}/${rel}" -o "$temporary"; then
+        echo "Failed to download ${rel} from ${BASE_URL}"
+        exit 1
+    fi
 
-        mv "$temporary" "$destination"
-        trap - EXIT
-    done
-else
-    echo "No arguments provided. Please specify the config files to download."
-    exit 1
-fi
+    mv "$temporary" "$destination"
+    trap - EXIT
+    echo "Installed $destination"
+done