Fix SSE route dependency and align architecture docs

dev.sh

@@ -21,7 +21,19 @@ CYAN='\033[0;36m'
 NC='\033[0m'
 
 load_env() {
-    if [ -f ".env" ]; then
+    load_env_file ".env"
+    load_env_file ".env.development"
+
+    API_HOST="${API_HOST:-0.0.0.0}"
+    API_PORT="${API_PORT:-8000}"
+    FRONTEND_PORT="${FRONTEND_PORT:-5173}"
+    FRONTEND_MODE="${FRONTEND_MODE:-dev}"
+}
+
+load_env_file() {
+    local env_file="$1"
+
+    if [ -f "$env_file" ]; then
         while IFS='=' read -r key value; do
             key="${key%$'\r'}"
             value="${value%$'\r'}"
@@ -34,13 +46,8 @@ load_env() {
                     export "$key=$value"
                     ;;
             esac
-        done < ".env"
+        done < "$env_file"
     fi
-
-    API_HOST="${API_HOST:-0.0.0.0}"
-    API_PORT="${API_PORT:-8000}"
-    FRONTEND_PORT="${FRONTEND_PORT:-5173}"
-    FRONTEND_MODE="${FRONTEND_MODE:-dev}"
 }
 
 ensure_log_dir() {