fix: validate config keys against known set in config set

[P-r-e-m-i-u-m]

Closes #6

Added validation in config_set() to reject unknown config keys before saving.

Changes

src/pumpfun_cli/commands/config.py

• Added KNOWN_KEYS = {"rpc", "keyfile", "priority_fee", "compute_units"}
• Added key validation in config_set() — rejects unknown keys with a clear error and hint showing valid keys

tests/test_commands/test_config_cmd.py

• Added test_config_set_unknown_key — asserts that typos like rpcc are rejected with exit code != 0 and error message containing "unknown config key" and "valid keys"

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Reviewing files that changed from the base of the PR and between f813aed and 819aa2c.

📒 Files selected for processing (2)

• src/pumpfun_cli/commands/config.py
• tests/test_commands/test_config_cmd.py

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