fix(api): 补全模型能力继承与响应推导

- 合并 base model 默认能力与平台覆盖项
- 在模型响应中补齐 text_generate 的上下文与推理能力字段
- 为相关逻辑补充测试和迁移脚本

apps/api/internal/store/postgres.go

@@ -150,6 +150,7 @@ type PlatformModel struct {
 	DisplayName           string         `json:"displayName"`
 	CapabilityOverride    map[string]any `json:"capabilityOverride,omitempty"`
 	Capabilities          map[string]any `json:"capabilities,omitempty"`
+	BaseCapabilities      map[string]any `json:"-"`
 	PricingMode           string         `json:"pricingMode"`
 	DiscountFactor        float64        `json:"discountFactor,omitempty"`
 	PricingRuleSetID      string         `json:"pricingRuleSetId,omitempty"`
@@ -806,13 +807,28 @@ func (s *Store) listModels(ctx context.Context, platformID string) ([]PlatformMo
 	rows, err := s.pool.Query(ctx, `
 SELECT m.id::text, m.platform_id::text, COALESCE(m.base_model_id::text, ''), p.provider, p.name,
        m.model_name, COALESCE(NULLIF(m.provider_model_name, ''), m.model_name), COALESCE(m.model_alias, ''), m.model_type, m.display_name,
-       m.capability_override, m.capabilities, m.pricing_mode, COALESCE(m.discount_factor, 0)::float8,
+       m.capability_override, m.capabilities, COALESCE(b.capabilities, '{}'::jsonb), m.pricing_mode, COALESCE(m.discount_factor, 0)::float8,
        COALESCE(m.pricing_rule_set_id::text, ''), m.billing_config_override, m.billing_config,
        m.permission_config, m.retry_policy, m.rate_limit_policy, COALESCE(m.runtime_policy_set_id::text, ''), m.runtime_policy_override,
        COALESCE(to_char(m.cooldown_until AT TIME ZONE 'UTC', 'YYYY-MM-DD"T"HH24:MI:SS.MS"Z"'), ''),
        m.enabled, m.created_at, m.updated_at
 FROM platform_models m
 JOIN integration_platforms p ON p.id = m.platform_id
+LEFT JOIN LATERAL (
+  SELECT catalog.capabilities
+  FROM base_model_catalog catalog
+  WHERE (m.base_model_id IS NOT NULL AND catalog.id = m.base_model_id)
+     OR (
+       catalog.provider_key = p.provider
+       AND (
+         catalog.provider_model_name = COALESCE(NULLIF(m.provider_model_name, ''), m.model_name)
+         OR catalog.canonical_model_key = p.provider || ':' || COALESCE(NULLIF(m.provider_model_name, ''), m.model_name)
+       )
+     )
+  ORDER BY CASE WHEN m.base_model_id IS NOT NULL AND catalog.id = m.base_model_id THEN 0 ELSE 1 END,
+           catalog.updated_at DESC
+  LIMIT 1
+) b ON true
 `+where+`
 ORDER BY m.model_type ASC, m.model_name ASC`, args...)
 	if err != nil {
@@ -825,6 +841,7 @@ ORDER BY m.model_type ASC, m.model_name ASC`, args...)
 		var model PlatformModel
 		var capabilityOverride []byte
 		var capabilities []byte
+		var baseCapabilities []byte
 		var billingConfigOverride []byte
 		var billingConfig []byte
 		var permissionConfig []byte
@@ -845,6 +862,7 @@ ORDER BY m.model_type ASC, m.model_name ASC`, args...)
 			&model.DisplayName,
 			&capabilityOverride,
 			&capabilities,
+			&baseCapabilities,
 			&model.PricingMode,
 			&model.DiscountFactor,
 			&model.PricingRuleSetID,
@@ -864,6 +882,7 @@ ORDER BY m.model_type ASC, m.model_name ASC`, args...)
 		}
 		model.CapabilityOverride = decodeObject(capabilityOverride)
 		model.Capabilities = decodeObject(capabilities)
+		model.BaseCapabilities = decodeObject(baseCapabilities)
 		model.ModelType = decodeStringArray(modelTypeBytes)
 		model.BillingConfigOverride = decodeObject(billingConfigOverride)
 		model.BillingConfig = decodeObject(billingConfig)