Replace println-based setup wizard with dialoguer TUI prompts

Add dialoguer, indicatif, and console dependencies to replace the
hand-drawn box prompts with proper interactive TUI components:

- Use dialoguer::Confirm for yes/no prompts (embedding, reranker)
- Use dialoguer::Input for text inputs with default values
- Use dialoguer::Select for reranker model selection
- Use indicatif spinner for directory creation and binary install
- Use console::style for colored status messages

Simplify the wizard flow by removing provider selection and dimensions
input, using sensible defaults (SiliconFlow + Qwen3-Embedding-4B).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: iohub

rust-core/Cargo.lock

@@ -61,6 +61,11 @@ openssl-sys = { version = "0.9", features = ["vendored"] }
 # 文件系统监控 (MCP server 自动索引)
 notify = "7"
 
+# TUI interactive prompts
+dialoguer = "0.11"
+indicatif = "0.17"
+console = "0.15"
+
 # Unix daemon support (fork, setsid)
 [target.'cfg(unix)'.dependencies]
 libc = "0.2"