feat: Universal Agent API Bridge & Modular Skill Engine Overhaul

- Add Gitea/Vikunja API sync scripts to eliminate prompt-pollution.
- Move submodules to .agent/vendor for proper CLI encapsulation.
- Implement extract_skills.js to dynamically flatten 19 active skills.
- Translate CLI skill descriptions to Korean.
- Mask .env.agent in .gitignore ensuring true Zero-Pollution secure template.

.agent/config/.env.agent.template

@@ -13,9 +13,12 @@ AGENT_OPERATING_MODE="TEST"
 AGENT_PYTHON_PATH="python"
 
 # 1. Gitea Wiki (지식 동기화용)
-WIKI_REPO_URL="https://git.variet.net/Variet/[YOUR_PROJECT_NAME].wiki.git"
+GITEA_API_URL="https://git.variet.net/api/v1"
+GITEA_USERNAME="[YOUR_GITEA_USERNAME]"
+GITEA_API_TOKEN="[YOUR_GITEA_TOKEN]"
+WIKI_REPO_URL="https://${GITEA_USERNAME}:${GITEA_API_TOKEN}@git.variet.net/Variet/[YOUR_PROJECT_NAME].wiki.git"
 
 # 2. Vikunja Task Board (업무 완료 보고용)
 VIKUNJA_API_URL="https://tasks.variet.net/api/v1"
 VIKUNJA_PROJECT_ID="[YOUR_PROJECT_ID]"
-VIKUNJA_TOKEN="[YOUR_TOKEN_IF_NEEDED]"
+VIKUNJA_API_TOKEN="[YOUR_VIKUNJA_TOKEN]"