fix: add missing model_type placeholder in _format_file (fixes #142)

[awanawana]

Summary

• Fixes the format string mismatch in _format_file() method
• Adds missing mt_{} placeholder for self.model_type

Problem

The format string had 9 placeholders but 10 arguments were passed:

# Before (9 placeholders, 10 args - mismatch!)
model_dir = "..._nc_{}_tpm_{}_tpv_{}_hs_{}_ac_{}_do_{}_lr_{}_mo_{}_rp_{}".format(
    self.n_components,       # 1
    0.0,                     # 2
    1 - (1.0 / self.n_components),  # 3
    self.model_type,         # 4 - NO PLACEHOLDER!
    self.hidden_sizes,       # 5
    ...
)

This causes self.model_type to be silently ignored, meaning different model types (CombinedTM, ZeroShotTM) would save to the same directory.

Solution

Added mt_{} placeholder:

# After (10 placeholders, 10 args - correct!)
model_dir = "..._nc_{}_tpm_{}_tpv_{}_mt_{}_hs_{}_ac_{}_do_{}_lr_{}_mo_{}_rp_{}".format(...)

Related

Fixes #142

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