feat: Update devcontainer setup with Dockerfile and improved script for pre-commit hooks

.devcontainer/Dockerfile

@@ -0,0 +1,7 @@
+# .devcontainer/Dockerfile
+FROM mcr.microsoft.com/devcontainers/javascript-node:1-20-bullseye
+
+# CACHED INSTALLATION:
+# Install global NPM packages here. This creates a cached Docker layer.
+# We use 'su node' to ensure permissions are correct for the non-root user.
+RUN su node -c "npm install -g @google/gemini-cli"

.devcontainer/devcontainer.json

@@ -11,9 +11,7 @@
     },
     "ghcr.io/devcontainers/features/git:1": {},
     "ghcr.io/devcontainers/features/git-lfs:1": {},
-    "ghcr.io/devcontainers-extra/features/pipx-package:1": {
+    "ghcr.io/devcontainers-extra/features/pre-commit:2": {}
-      "packages": "pre-commit, ruff"
-    }
   },
   "customizations": {
     "vscode": {
@@ -30,13 +28,13 @@
       }
     }
   },
-  "postCreateCommand": "npm install",
   "postStartCommand": "bash .devcontainer/setup.sh",
-  "remoteUser": "node",
+  "remoteUser": "vscode",
+  "updateRemoteUserUID": true,
   "mounts": [
     "source=pipx-venvs,target=/home/node/.local/share/pipx,type=volume",
     "source=pipx-bin,target=/home/node/.local/bin,type=volume",
     "source=pre-commit-cache,target=/home/node/.cache/pre-commit,type=volume",
-    "source=${localEnv:HOME}/.gemini,target=/home/node/.gemini,type=bind"
+    "source=${localEnv:USERPROFILE}/.gemini,target=/home/node/.gemini,type=bind"
   ]
 }

.devcontainer/setup.sh

@@ -1,16 +1,11 @@
 #!/bin/bash
 
 # 1. Fix Git Permissions (Critical in Docker)
-sudo chown -R $(whoami) .git
 git config --global --add safe.directory $(pwd)
 
 # 2. Re-connect Git Hooks
-# 'pre-commit install' is idempotent (it checks if the hook exists and exits fast).
-# It's safe to run on every start.
 if command -v pre-commit &> /dev/null; then
     pre-commit install
 else
     echo "⚠️ Warning: pre-commit not found. Skipping hook installation."
 fi
-
-# We REMOVED 'npm install' from here to speed up your daily workflow.