fix: [#102] Fix configuration priority order to match documentation

[nandanosql]

Fixes #102

Problem

The resolve_config_value function in config.py had conflicting priority definitions:

• Code: CLI > ENV > Config > Default
• Documentation (README): CLI > Config > ENV > Default

This caused confusion and unexpected behavior where environment variables would override values in the config file, contrary to what users would expect from reading the docs.

Solution

Reordered the priority checks in resolve_config_value to match the documented priority:

# Before (wrong):
if cli_value is not None: return cli_value
if env_var and os.getenv(env_var): return os.getenv(env_var)  # ENV checked before Config
if config_value is not None: return config_value

# After (correct):
if cli_value is not None: return cli_value
if config_value is not None: return config_value  # Config checked before ENV
if env_var and os.getenv(env_var): return os.getenv(env_var)

The docstring was also updated to reflect the correct priority.

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