Add inference mode selector: Full / MDX Only / RVC Only

Fix runtime errors: FAISS index validation, FP16 dtype mismatch, soundfile error

Remove rmvpe+, add all SawitProject/rvc supported f0 methods

Rename params to match SawitProject/rvc API naming

Replace rvc-python with SawitProject/rvc for modern Python compatibility

fix: resolve all app errors and bugs

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

Update src/main.py

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