docs(task-pricing): document video pricing table testing

docs/testing/video-pricing-table.md

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+# Video Pricing Table Testing
+
+This guide verifies task video billing with model-level pricing tables.
+
+## Prerequisites
+
+- Admin session cookie for `/api/option/model_pricing`.
+- API token for `/v1/videos`.
+- A usable Hailuo channel for `hailuo-video`.
+- A usable Seedance/Doubao channel for `seedance-2`; for deterministic usage billing, point it at a mock upstream that returns `usage.total_tokens`.
+- `QuotaPerUnit = 500000` unless your environment overrides it.
+
+Set shell variables:
+
+```bash
+BASE_URL=http://127.0.0.1:3000
+ADMIN_COOKIE='session=...'
+API_TOKEN='sk-...'
+```
+
+## Hailuo Per Call
+
+Configure an exact per-call matrix:
+
+```bash
+curl -sS -X PUT "$BASE_URL/api/option/model_pricing/hailuo-video" \
+  -H "Cookie: $ADMIN_COOKIE" \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "schema_version": 1,
+    "scope": "model",
+    "billing_unit": "per_call",
+    "preconsume_strategy": "exact",
+    "dimensions": [
+      {"key": "resolution", "source": "request.resolution", "type": "string", "default": null},
+      {"key": "duration", "source": "request.duration", "type": "number", "default": null}
+    ],
+    "table": [
+      {"resolution": "768P", "duration": 10, "price": 0.04, "source": "manual"}
+    ],
+    "fallback": {"strategy": "reject"}
+  }'
+```
+
+Submit a matched request:
+
+```bash
+curl -sS -X POST "$BASE_URL/v1/videos" \
+  -H "Authorization: Bearer $API_TOKEN" \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "model": "hailuo-video",
+    "prompt": "a pricing smoke test",
+    "resolution": "768P",
+    "duration": 10
+  }'
+```
+
+Expected quota:
+
+```text
+actual_quota = price_usd * QuotaPerUnit * group_ratio
+             = 0.04 * 500000 * 1
+             = 20000
+```
+
+Submit an unsupported row and expect HTTP 400 with no quota change:
+
+```bash
+curl -i -X POST "$BASE_URL/v1/videos" \
+  -H "Authorization: Bearer $API_TOKEN" \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "model": "hailuo-video",
+    "prompt": "a pricing reject test",
+    "resolution": "1080P",
+    "duration": 10
+  }'
+```
+
+## Seedance Per 1M Tokens
+
+Configure a usage matrix:
+
+```bash
+curl -sS -X PUT "$BASE_URL/api/option/model_pricing/seedance-2" \
+  -H "Cookie: $ADMIN_COOKIE" \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "schema_version": 1,
+    "scope": "model",
+    "billing_unit": "per_1m_tokens",
+    "preconsume_strategy": "minimum",
+    "dimensions": [
+      {"key": "resolution", "source": "request.resolution", "type": "string", "default": null}
+    ],
+    "table": [
+      {"resolution": "720P", "price": 0.5, "source": "manual"}
+    ],
+    "fallback": {"strategy": "reject"}
+  }'
+```
+
+Submit:
+
+```bash
+curl -sS -X POST "$BASE_URL/v1/videos" \
+  -H "Authorization: Bearer $API_TOKEN" \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "model": "seedance-2",
+    "prompt": "a usage pricing smoke test",
+    "resolution": "720P",
+    "duration": 5
+  }'
+```
+
+Fetch until complete:
+
+```bash
+TASK_ID=task_xxx
+curl -sS "$BASE_URL/v1/videos/$TASK_ID" \
+  -H "Authorization: Bearer $API_TOKEN"
+```
+
+When the upstream completion response contains `usage.total_tokens = 1000`, expected final quota is:
+
+```text
+actual_quota = total_tokens * token_unit_price_usd / 1_000_000 * QuotaPerUnit * group_ratio
+             = 1000 * 0.5 / 1_000_000 * 500000 * 1
+             = 250
+```
+
+The settlement must use the frozen `token_unit_price_usd` stored on the task billing context. Changing or deleting the current `ModelPricingRules` option after submit must not affect the completion calculation for that task.
+
+## Delete Config And Legacy Fallback
+
+Delete a matrix config:
+
+```bash
+curl -sS -X DELETE "$BASE_URL/api/option/model_pricing/hailuo-video" \
+  -H "Cookie: $ADMIN_COOKIE"
+curl -sS -X DELETE "$BASE_URL/api/option/model_pricing/seedance-2" \
+  -H "Cookie: $ADMIN_COOKIE"
+```
+
+After deletion, requests for that model return to the legacy `ModelPrice` path. The `ModelPrice` option itself is not removed or modified by the model pricing table API.
+
+## Smoke Script
+
+The same flow can be run with:
+
+```bash
+"C:/Users/28221/.conda/envs/py312/python.exe" test-scripts/test_video_pricing.py
+```
+
+Required environment:
+
+```bash
+NEW_API_BASE_URL=http://127.0.0.1:3000
+NEW_API_ADMIN_USERNAME=root
+NEW_API_ADMIN_PASSWORD=123456
+NEW_API_TOKEN=sk-...
+```