Add Gitea repository management skill

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

skills/gitea/SKILL.md

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+---
+name: gitea
+description: Gitea repository management via REST API. Use when user explicitly mentions "gitea" for: (1) Creating repositories, (2) Listing repositories, (3) Deleting repositories, (4) Pushing code to Gitea. Default server: https://gitea.server10086.icu, default account: admin. Requires GITEA_TOKEN environment variable.
+---
+
+# Gitea Repository Management
+
+## Configuration
+
+- **Server**: `https://gitea.server10086.icu`
+- **API Base**: `https://gitea.server10086.icu/api/v1`
+- **Default Account**: `admin`
+- **Auth Header**: `Authorization: token $GITEA_TOKEN`
+
+**Always verify GITEA_TOKEN exists before any operation:**
+```bash
+if [ -z "$GITEA_TOKEN" ]; then
+  echo "Error: GITEA_TOKEN environment variable not set"
+  exit 1
+fi
+```
+
+## Repository Operations
+
+### List Repositories
+
+```bash
+# List all repos for current user
+curl -s -X GET "https://gitea.server10086.icu/api/v1/user/repos" \
+  -H "Authorization: token $GITEA_TOKEN"
+```
+
+### Create Repository
+
+```bash
+curl -X POST "https://gitea.server10086.icu/api/v1/admin/repos" \
+  -H "Authorization: token $GITEA_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "name": "repo-name",
+    "description": "Repository description",
+    "private": false,
+    "auto_init": false
+  }'
+```
+
+### Delete Repository
+
+```bash
+curl -X DELETE "https://gitea.server10086.icu/api/v1/repos/admin/repo-name" \
+  -H "Authorization: token $GITEA_TOKEN"
+```
+
+### Create and Push Current Directory
+
+```bash
+REPO_NAME=$(basename $(pwd))
+
+# Create repo via API
+curl -X POST "https://gitea.server10086.icu/api/v1/admin/repos" \
+  -H "Authorization: token $GITEA_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d "{\"name\":\"$REPO_NAME\",\"auto_init\":false}"
+
+# Initialize and push
+git init
+git add .
+git commit -m "Initial commit"
+git remote add origin "https://gitea.server10086.icu/admin/$REPO_NAME.git"
+git push -u origin main
+```
+
+## Error Handling
+
+| Status | Meaning |
+|--------|---------|
+| 401 | Invalid or missing GITEA_TOKEN |
+| 409 | Repository already exists |
+| 404 | Repository not found |
+| 204 | Successful deletion (expected) |