feat(cli): add --max_llm_calls and --avatar_config flags to web and api_server

[EaCognitive]

Fixes #5435
Fixes #5434

Problem

Several key parameters in the ADK SDK's RunConfig (max_llm_calls and avatar_config) are not currently exposed via the CLI in the adk run, adk web, or adk api_server commands. This limits the ability of developers to control costs and customize the visual appearance of agents across all interaction modes.

Solution

This PR adds both --max_llm_calls and --avatar_config flags to the common FastAPI options decorator and ensures they are correctly passed to the CLI runner.

Changes

• src/google/adk/cli/cli_tools_click.py: Added the new flags and updated all relevant command arguments (run, web, api_server).
• src/google/adk/cli/cli.py: Updated run_cli and its helpers to parse and pass the new parameters to the Runner.
• src/google/adk/cli/fast_api.py: Updated get_fast_api_app to pass the new parameters.
• src/google/adk/cli/adk_web_server.py: Integrated parameters into AdkWebServer and all RunConfig instantiations.

Verification

• Verified flags appear in help text for all three commands.
• Verified avatar_config correctly handles both inline JSON and file paths.

[EaCognitive]

Resubmitting as part of a comprehensive CLI update PR to trigger a fresh CLA check.