feat: provider api_formats 可空继承、OpenAI 图片 edit/variation 与用量配额多项补强

- 鉴权: provider_api_keys.api_formats 改为可空，OAuth 托管 key 自动继承 provider endpoints 激活格式，相关 handler/测试同步更新
- 图片 planner: OpenAI 图片路由新增 edit/variation 操作并完善参数校验、响应合并与流式处理
- 用量: user me usage 返回区分 client_requested_stream/upstream_is_stream，前端 usage 列表筛选与展示增强
- 统计: stats_daily_model 新增 cache_creation_ephemeral_5m/1h tokens 字段与回填链路
- 配额/observability: quota repository 新增内存与 SQL 扩展，admin observability usage 字段扩充
- 其它: OAuth 导入/轮询收敛、provider 汇总与 pool admin 读写链路小修、新增 system_config 缓存与 provider template handler

Closes #318

Co-authored-by: Entropy.Xu <53283266+Entropy-Xu@users.noreply.github.com>

crates/aether-data/src/repository/candidate_selection/sql.rs

@@ -64,6 +64,27 @@ WHERE p.is_active = TRUE
   AND LOWER(pe.api_format) = LOWER($1)
   AND (
     pak.api_formats IS NULL
+    OR (
+      LOWER(BTRIM(p.provider_type)) IN (
+        'claude_code',
+        'codex',
+        'gemini_cli',
+        'vertex_ai',
+        'antigravity'
+      )
+      AND LOWER(BTRIM(pak.auth_type)) = 'oauth'
+    )
+    OR (
+      LOWER(BTRIM(p.provider_type)) = 'kiro'
+      AND (
+        LOWER(BTRIM(pak.auth_type)) = 'oauth'
+        OR (
+          LOWER(BTRIM(pak.auth_type)) = 'bearer'
+          AND pak.auth_config IS NOT NULL
+          AND BTRIM(pak.auth_config) <> ''
+        )
+      )
+    )
     OR EXISTS (
       SELECT 1
       FROM json_array_elements_text(pak.api_formats) AS fmt(value)
@@ -137,6 +158,27 @@ WHERE p.is_active = TRUE
   AND gm.name = $2
   AND (
     pak.api_formats IS NULL
+    OR (
+      LOWER(BTRIM(p.provider_type)) IN (
+        'claude_code',
+        'codex',
+        'gemini_cli',
+        'vertex_ai',
+        'antigravity'
+      )
+      AND LOWER(BTRIM(pak.auth_type)) = 'oauth'
+    )
+    OR (
+      LOWER(BTRIM(p.provider_type)) = 'kiro'
+      AND (
+        LOWER(BTRIM(pak.auth_type)) = 'oauth'
+        OR (
+          LOWER(BTRIM(pak.auth_type)) = 'bearer'
+          AND pak.auth_config IS NOT NULL
+          AND BTRIM(pak.auth_config) <> ''
+        )
+      )
+    )
     OR EXISTS (
       SELECT 1
       FROM json_array_elements_text(pak.api_formats) AS fmt(value)