Rebrand Coffee Note as TierNote

[edison7009]

What changed

• Renames the visible desktop, website, package, and release identity from Coffee Note to TierNote.
• Moves production links and update endpoints to tiernote.org and repository links to edison7009/TierNote.
• Preserves the v0.1.8 bundle identifier, app-data directory, workspace metadata, storage keys, and built-in plugin IDs so existing user data and configuration remain available.
• Adds Windows installer migration logic that removes the legacy Coffee Note application while retaining local app data.
• Updates future release asset names to TierNote and keeps the current v0.1.8 download matcher compatible.

Why

The product is returning to the TierNote name and the public repository/domain have been renamed accordingly.

Validation

• 166 frontend tests passed
• 177 Rust tests passed
• TypeScript typecheck passed
• Bilingual starter library check passed
• Production frontend build passed
• Rust formatting and Clippy passed with warnings denied
• Windows NSIS bundle built successfully as TierNote_0.1.8_x64-setup.exe
• Desktop client launched as tiernote.exe; existing notes and conversation history remained readable

[cloudflare-workers-and-pages]

Deploying coffee-note with    Cloudflare Pages

Latest commit:	b6bcaf8
Status:	✅  Deploy successful!
Preview URL:	https://d81dd0d8.coffee-note-6u7.pages.dev
Branch Preview URL:	https://codex-tiernote-rebrand.coffee-note-6u7.pages.dev

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