What type of PR is this?

• feat (new feature)
• fix (bug fix)
• docs (documentation)
• style (formatting, no code change)
• refactor (code change that neither fixes a bug nor adds a feature)
• perf (performance improvement)
• test (adding or updating tests)
• chore (maintenance, tooling)
• build / ci (build or CI changes)

Which issue(s) this PR fixes

N/A

What this PR does / why we need it

Replace the 6 hand-written prompt functions (prompt(), prompt_secret(), read_password_line(), prompt_multi_choice(), prompt_choice(), prompt_confirm()) and libc dependency with the cliclack crate for a polished interactive onboarding wizard.

Changes

CLI (memoria init -i)

• Rewrite cmd_init_interactive using cliclack components: intro/outro, note, select, multiselect, input, password, confirm, spinner
• Project directory is now editable with real-time subdirectory suggestions (type a path ending with / to see suggestions)
• Embedding flow: select preset first, then all 4 fields shown with preset values as defaults
• Existing mcp.json values pre-fill all fields (DB host/port/user/pass, embedding URL/key/model/dim)
• Password and API key fields allow Enter to keep existing value when one exists
• All embedding presets show explicit URLs (including https://api.openai.com/v1 for OpenAI)

Dependencies

• Added: cliclack = "0.4"
• Removed: libc (unix target dependency)

README

• Recommend memoria init -i (interactive mode) as primary setup method
• Add memoria init -i to commands table
• Simplify install section (latest only, remove specific version example)