feat: implement role-based configuration system for CLI with automatic API key management

- Add role detection to command groups (admin, client, miner, blockchain)
- Load role-specific config files (~/.aitbc/{role}-config.yaml)
- Add role field to Config class with environment variable support
- Implement automatic role detection from invoked subcommand
- Add development mode API key bypass for testing (APP_ENV=dev)
- Update CLI checklist with role-based configuration documentation
- Add configuration override priority and

cli/aitbc_cli/commands/admin.py

@@ -8,9 +8,12 @@ from ..utils import output, error, success
 
 
 @click.group()
-def admin():
+@click.pass_context
+def admin(ctx):
     """System administration commands"""
-    pass
+    # Set role for admin commands
+    ctx.ensure_object(dict)
+    ctx.parent.detected_role = 'admin'
 
 
 @admin.command()

cli/aitbc_cli/commands/blockchain.py

@@ -19,9 +19,12 @@ from ..utils import output, error
 
 
 @click.group()
-def blockchain():
+@click.pass_context
+def blockchain(ctx):
     """Query blockchain information and status"""
-    pass
+    # Set role for blockchain commands
+    ctx.ensure_object(dict)
+    ctx.parent.detected_role = 'blockchain'
 
 
 @blockchain.command()

cli/aitbc_cli/commands/client.py

@@ -9,9 +9,12 @@ from ..utils import output, error, success
 
 
 @click.group()
-def client():
+@click.pass_context
+def client(ctx):
     """Submit and manage jobs"""
-    pass
+    # Set role for client commands
+    ctx.ensure_object(dict)
+    ctx.parent.detected_role = 'client'
 
 
 @client.command()

cli/aitbc_cli/commands/miner.py

@@ -9,10 +9,18 @@ from typing import Optional, Dict, Any, List
 from ..utils import output, error, success
 
 
-@click.group()
-def miner():
+@click.group(invoke_without_command=True)
+@click.pass_context
+def miner(ctx):
     """Register as miner and process jobs"""
-    pass
+    # Set role for miner commands - this will be used by parent context
+    ctx.ensure_object(dict)
+    # Set role at the highest level context (CLI root)
+    ctx.find_root().detected_role = 'miner'
+    
+    # If no subcommand was invoked, show help
+    if ctx.invoked_subcommand is None:
+        click.echo(ctx.get_help())
 
 
 @miner.command()