docs(ide): refresh TuyaOpen IDE tutorials — calibrated EN/ZH text, sp…

[jianning773]

…lit locale screenshots, rendering fixes

Re-align the IDE tutorial pages (docs/tutorials/_tuyaopen-ide-*.md and the zh/ mirrors) with the finalized 3.0 source docs and the actual IDE UI, in both English and 简体中文.

Content (EN + ZH):

• Install: add an "Install Git" section; rework the manual install to the official-site flow (Install Extension → Download .vsix); bump the .vsix version 0.1.1 → 0.1.5.
• Practice 1–3: calibrate every IDE button/menu label against the IDE i18n source (en.ts / zh-CN.ts) so docs match the UI exactly — Boards, Compile / Firmware Operations, New Project with This Board, Demos, Cloud IoT/Agent Dev, Licenses / Key Management, Mini App Panel Dev, Build MiniApp, Upload to Cloud, Rebind MiniApp, Get 2 Free Licenses, etc.
• Practice 3: add the DP-cooperation intro line; rewrite Step 3 to 4 steps; add a new Step 4 "Bind the mini-app to the product".
• Practice 2: simplify the "Create project" flow (Step 5 = copy the PID).

Screenshots:

• English pages now use their own English-UI screenshots.
• Chinese pages now use their own Chinese-UI screenshots (-zh set), sourced from the finalized Chinese doc. EN and ZH previously shared one image set.

Shared TutorialShell rendering:

• Markdown code blocks now render as native Docusaurus CodeBlocks (copy button + theme-adaptive + syntax highlighting) via an MDXProvider wrap.
• Replace the hardcoded dark code/pre/figure backgrounds with theme-adaptive styles so light mode no longer shows dark blocks.
• Center tutorial images; hide the redundant figcaption (alt stays on ).

Nav: add zh entries for the new Install-Git and Practice-3 Step-4 sections.

Verified: npm run build passes for both en and zh locales.