docs: update all documentation for 12 LLM platforms and 18 agents

- README.md + 11 i18n READMEs: 5→12 LLM platforms, 11→18 agents, new platform/agent tables
- CLAUDE.md: updated --target list, adaptor directory tree
- CHANGELOG.md: added v3.4.0 entry with all Phase 1-4 changes
- docs/reference/CLI_REFERENCE.md: new --target and --agent options
- docs/reference/FEATURE_MATRIX.md: updated all platform counts and tables
- docs/user-guide/04-packaging.md: new platform and agent rows
- docs/FAQ.md: expanded platform/agent answers
- docs/zh-CN/*: synchronized Chinese documentation

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

CLAUDE.md

@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-**Skill Seekers** converts documentation from 17 source types into production-ready formats for 16+ AI platforms (LLM platforms, RAG frameworks, vector databases, AI coding assistants). Published on PyPI as `skill-seekers`.
+**Skill Seekers** converts documentation from 17 source types into production-ready formats for 24+ AI platforms (LLM platforms, RAG frameworks, vector databases, AI coding assistants). Published on PyPI as `skill-seekers`.
 
 **Version:** 3.3.0 | **Python:** 3.10+ | **Website:** https://skillseekersweb.com/
 
@@ -57,7 +57,7 @@ Entry point `src/skill_seekers/cli/main.py` maps subcommands to modules. The `cr
 ```
 skill-seekers create <source>     # Auto-detect: URL, owner/repo, ./path, file.pdf, etc.
 skill-seekers <type> [options]    # Direct: scrape, github, pdf, word, epub, video, jupyter, html, openapi, asciidoc, pptx, rss, manpage, confluence, notion, chat
-skill-seekers package <dir>       # Package for platform (--target claude/gemini/openai/markdown, --format langchain/llama-index/haystack/chroma/faiss/weaviate/qdrant)
+skill-seekers package <dir>       # Package for platform (--target claude/gemini/openai/markdown/minimax/opencode/kimi/deepseek/qwen/openrouter/together/fireworks, --format langchain/llama-index/haystack/chroma/faiss/weaviate/qdrant)
 ```
 
 ### Data Flow (5 phases)
@@ -78,6 +78,14 @@ src/skill_seekers/cli/adaptors/
 ├── gemini_adaptor.py    # --target gemini
 ├── openai_adaptor.py    # --target openai
 ├── markdown_adaptor.py  # --target markdown
+├── minimax_adaptor.py   # --target minimax
+├── opencode_adaptor.py  # --target opencode
+├── kimi_adaptor.py      # --target kimi
+├── deepseek_adaptor.py  # --target deepseek
+├── qwen_adaptor.py      # --target qwen
+├── openrouter_adaptor.py # --target openrouter
+├── together_adaptor.py  # --target together
+├── fireworks_adaptor.py # --target fireworks
 ├── langchain.py         # --format langchain
 ├── llama_index.py       # --format llama-index
 ├── haystack.py          # --format haystack