fix: raise TypeError for non-dict config in BaseDetector

[deveshreddyp]

Description

Closes #117

Added type validation in the BaseDetector constructor to explicitly raise a TypeError when a non-dictionary config is passed. This prevents downstream AttributeError crashes and ensures cleaner error handling in the detection pipeline.

cc @steadhac - Fixed per the "Must Fix" bugs list!

(Note: The detector-specific pytest checks are all passing green locally. There are a few unrelated environment failures on main like the Windows path separator in test_sqlite_url, but the core detection suite is clean). Let me know if you need any adjustments!

[stealthwhizz]

@saikishu @steadhac Hey, just a heads up - PR #261 already fixes #117 along with #131 and #130.
It also adds the TypeError catch in registry.py so the registry handles the new exception, and includes unit tests for both the base detector and tool_call detector.

This PR might be a duplicate. Worth checking #261 before merging this one.