docs: add TESTING.md with API testing guide

TESTING.md

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+# SimpleNote Web - Testing Guide
+
+## Running the Server Locally
+
+```bash
+cd simplenote-projects/simplenote-web
+npm install
+npm start
+```
+
+The server starts on `http://localhost:3000` by default.
+
+### Environment Variables
+
+| Variable      | Default                        | Description                |
+|---------------|-------------------------------|---------------------------|
+| `PORT`        | `3000`                        | Server port               |
+| `HOST`        | `0.0.0.0`                     | Server host               |
+| `DATA_ROOT`   | `./data`                      | Document storage path     |
+| `ADMIN_TOKEN` | `snk_initial_admin_token_change_me` | Initial admin token |
+| `CORS_ORIGIN` | `*`                           | CORS allowed origin      |
+| `API_PREFIX`  | `/api/v1`                     | API route prefix          |
+
+## API Endpoints
+
+Base URL: `http://localhost:3000/api/v1`
+
+All endpoints (except `/health` and `/auth/verify`) require:
+```
+Authorization: Bearer <token>
+```
+
+### Health Check
+
+```bash
+curl http://localhost:3000/health
+```
+
+### Auth Endpoints
+
+**Generate token (admin only):**
+```bash
+# Using initial admin token
+curl -X POST http://localhost:3000/api/v1/auth/token \
+  -H "Authorization: Bearer snk_initial_admin_token_change_me" \
+  -H "Content-Type: application/json" \
+  -d '{"label": "test-token"}'
+```
+
+**Verify token:**
+```bash
+curl http://localhost:3000/api/v1/auth/verify \
+  -H "Authorization: Bearer <token>"
+```
+
+### Library Endpoints
+
+**Create a library:**
+```bash
+curl -X POST http://localhost:3000/api/v1/libraries \
+  -H "Authorization: Bearer <token>" \
+  -H "Content-Type: application/json" \
+  -d '{"name": "My Project"}'
+```
+
+**List root libraries:**
+```bash
+curl http://localhost:3000/api/v1/libraries \
+  -H "Authorization: Bearer <token>"
+```
+
+**Get library contents:**
+```bash
+curl http://localhost:3000/api/v1/libraries/<library-id> \
+  -H "Authorization: Bearer <token>"
+```
+
+**Get library tree:**
+```bash
+curl http://localhost:3000/api/v1/libraries/<library-id>/tree \
+  -H "Authorization: Bearer <token>"
+```
+
+**Delete library:**
+```bash
+curl -X DELETE http://localhost:3000/api/v1/libraries/<library-id> \
+  -H "Authorization: Bearer <token>"
+```
+
+### Document Endpoints
+
+**Create document:**
+```bash
+curl -X POST http://localhost:3000/api/v1/documents \
+  -H "Authorization: Bearer <token>" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "title": "API Requirements",
+    "libraryId": "<library-id>",
+    "content": "# API Requirements\n\n## Description\n...",
+    "tags": ["backend", "api"],
+    "type": "requirement",
+    "priority": "high",
+    "status": "draft"
+  }'
+```
+
+**List documents (with filters):**
+```bash
+# All documents
+curl "http://localhost:3000/api/v1/documents" \
+  -H "Authorization: Bearer <token>"
+
+# Filter by tag
+curl "http://localhost:3000/api/v1/documents?tag=backend" \
+  -H "Authorization: Bearer <token>"
+
+# Filter by library
+curl "http://localhost:3000/api/v1/documents?library=<library-id>" \
+  -H "Authorization: Bearer <token>"
+
+# Filter by type
+curl "http://localhost:3000/api/v1/documents?type=requirement" \
+  -H "Authorization: Bearer <token>"
+
+# Filter by status
+curl "http://localhost:3000/api/v1/documents?status=draft" \
+  -H "Authorization: Bearer <token>"
+
+# With pagination
+curl "http://localhost:3000/api/v1/documents?limit=10&offset=0" \
+  -H "Authorization: Bearer <token>"
+```
+
+**Get document:**
+```bash
+curl http://localhost:3000/api/v1/documents/<doc-id> \
+  -H "Authorization: Bearer <token>"
+```
+
+**Update document:**
+```bash
+curl -X PUT http://localhost:3000/api/v1/documents/<doc-id> \
+  -H "Authorization: Bearer <token>" \
+  -H "Content-Type: application/json" \
+  -d '{"title": "Updated Title", "status": "approved"}'
+```
+
+**Delete document:**
+```bash
+curl -X DELETE http://localhost:3000/api/v1/documents/<doc-id> \
+  -H "Authorization: Bearer <token>"
+```
+
+**Export document as markdown:**
+```bash
+curl http://localhost:3000/api/v1/documents/<doc-id>/export \
+  -H "Authorization: Bearer <token>"
+```
+
+**Add tags to document:**
+```bash
+curl -X POST http://localhost:3000/api/v1/documents/<doc-id>/tags \
+  -H "Authorization: Bearer <token>" \
+  -H "Content-Type: application/json" \
+  -d '{"tags": ["new-tag", "another-tag"]}'
+```
+
+### Tag Endpoints
+
+**List all tags:**
+```bash
+curl http://localhost:3000/api/v1/tags \
+  -H "Authorization: Bearer <token>"
+```
+
+**Get documents with a tag:**
+```bash
+curl http://localhost:3000/api/v1/tags/backend \
+  -H "Authorization: Bearer <token>"
+```
+
+## Test Cases
+
+### Happy Path
+1. Create a library → receive library ID
+2. Create a document in that library → receive document ID
+3. List documents filtered by that library → document appears
+4. Get the document by ID → full content returned
+5. Update the document title and status
+6. Add tags to the document
+7. List tags → new tags appear with correct counts
+8. Get documents by tag → document appears
+9. Export document → markdown returned
+10. Delete document → confirmed deleted
+11. Delete library → confirmed deleted
+
+### Edge Cases
+- Create document without library ID → 400 error
+- Create document with empty title → 400 error
+- Get non-existent document → 404 error
+- Update non-existent document → 404 error
+- Delete non-existent document → 404 error
+- List documents with invalid tag → empty list
+- Create document with invalid type → defaults to "general"
+- Create document with invalid priority → defaults to "medium"
+- Unauthorized request (no token) → 401 error
+- Invalid token → 401 error
+
+### Security Tests
+- Path traversal attempt in library ID → should be handled safely
+- Very large content in document → limit enforced (10mb)
+- XSS in document title/content → no sanitization (intentional, markdown renderer handles it)