feat(kon): scaffold hybrid modular workspace

- Cargo workspace with 6 domain crates: core, audio, transcription, ai-formatting, storage, cloud-providers
- Minimal Tauri shell (lib.rs + main.rs) with plugin registration
- Svelte 5 frontend copied from Ramble v0.2
- All crates compile as empty stubs
- App identifier: uk.co.corbel.kon

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/ai-formatting/Cargo.toml

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+[package]
+name = "kon-ai-formatting"
+version = "0.1.0"
+edition = "2021"
+description = "Text post-processing pipeline: filler removal, British English conversion, formatting for Kon"
+
+[dependencies]
+kon-core = { path = "../core" }

crates/ai-formatting/src/lib.rs

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+// kon-ai-formatting: Filler removal, British English conversion,
+// text formatting, hallucination filtering, and paragraph breaks.

crates/audio/Cargo.toml

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+[package]
+name = "kon-audio"
+version = "0.1.0"
+edition = "2021"
+description = "Audio capture (cpal), VAD, resampling (rubato), file decoding (symphonia), WAV I/O (hound) for Kon"
+
+[dependencies]
+kon-core = { path = "../core" }

crates/audio/src/lib.rs

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+// kon-audio: Microphone capture, voice activity detection, resampling,
+// file decoding, and WAV I/O.

crates/cloud-providers/Cargo.toml

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+[package]
+name = "kon-cloud-providers"
+version = "0.1.0"
+edition = "2021"
+description = "BYOK cloud STT provider stubs and API key storage for Kon"
+
+[dependencies]
+kon-core = { path = "../core" }

crates/cloud-providers/src/lib.rs

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+// kon-cloud-providers: BYOK cloud STT provider implementations
+// and OS keychain API key storage.

crates/core/Cargo.toml

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+[package]
+name = "kon-core"
+version = "0.1.0"
+edition = "2021"
+description = "Core types, constants, traits, hardware detection, and model registry for Kon"
+
+[dependencies]

crates/core/src/lib.rs

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+// kon-core: Foundation types, constants, provider traits, hardware detection,
+// model registry, and recommendation engine.

crates/storage/Cargo.toml

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+[package]
+name = "kon-storage"
+version = "0.1.0"
+edition = "2021"
+description = "SQLite persistence, BM25 search, and file storage for Kon"
+
+[dependencies]
+kon-core = { path = "../core" }

crates/storage/src/lib.rs

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+// kon-storage: SQLite via sqlx, BM25 full-text search via probly-search,
+// and file storage path management.

crates/transcription/Cargo.toml

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+[package]
+name = "kon-transcription"
+version = "0.1.0"
+edition = "2021"
+description = "Speech-to-text engine wrappers, model management, and inference concurrency for Kon"
+
+[dependencies]
+kon-core = { path = "../core" }

crates/transcription/src/lib.rs

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+// kon-transcription: transcribe-rs wrapper behind SpeechToText trait,
+// unified model manager, and inference threading.