Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/SUBMODULE_SETUP.md

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+# Setting Up Explorer as Git Submodule
+
+## Current Status
+
+The explorer monorepo has been created and initialized as a git repository. It's currently configured as a local submodule.
+
+## Converting to Remote Repository (Recommended)
+
+To make the submodule work properly with remote repositories:
+
+### Step 1: Create Remote Repository
+
+1. Create a new repository on GitHub/GitLab/etc:
+   - Name: `chain-138-explorer`
+   - Description: "Blockchain explorer for ChainID 138"
+
+### Step 2: Push Explorer to Remote
+
+```bash
+cd explorer-monorepo
+
+# Add remote
+git remote add origin https://github.com/yourusername/chain-138-explorer.git
+
+# Push to remote
+git push -u origin main
+```
+
+### Step 3: Update Submodule Reference
+
+In the parent project:
+
+```bash
+cd /home/intlc/projects/proxmox
+
+# Update .gitmodules
+cat > .gitmodules <<EOF
+[submodule "explorer-monorepo"]
+	path = explorer-monorepo
+	url = https://github.com/yourusername/chain-138-explorer.git
+EOF
+
+# Update submodule reference
+git submodule sync
+git add .gitmodules
+git commit -m "Update explorer submodule to use remote repository"
+```
+
+## Using the Submodule
+
+### Clone Parent Project with Submodule
+
+```bash
+git clone <parent-repo-url>
+cd proxmox
+git submodule update --init --recursive
+```
+
+### Update Submodule
+
+```bash
+# Update to latest
+cd explorer-monorepo
+git pull origin main
+cd ..
+git add explorer-monorepo
+git commit -m "Update explorer submodule"
+```
+
+### Work on Submodule
+
+```bash
+cd explorer-monorepo
+# Make changes
+git add .
+git commit -m "Your changes"
+git push origin main
+cd ..
+git add explorer-monorepo
+git commit -m "Update submodule reference"
+```
+
+## Local Development (Current Setup)
+
+If keeping it as a local submodule:
+
+1. Work directly in `explorer-monorepo/`
+2. Commit changes normally
+3. The parent project will track the submodule state
+
+## Benefits of Monorepo Structure
+
+1. **Organization**: Clear separation of concerns
+2. **Versioning**: Independent versioning of explorer
+3. **Reusability**: Can be used in other projects
+4. **Deployment**: Standalone deployment scripts
+5. **Documentation**: Self-contained documentation
+