feat(server): schema v2契约——session_resume白名单/Event归属与区间字段/会话resume_of/request_id

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

server/tracker/constants.py

@@ -1,6 +1,7 @@
 import re
 
-EVENT_NAMES = {"page_view", "page_stay", "sdk_loaded"}
+EVENT_NAMES = {"page_view", "page_stay", "sdk_loaded", "session_resume"}
+SCHEMA_VERSION = 2  # 批级信缺省 = v1（旧SDK）
 MAX_EVENTS_PER_BATCH = 50
 MAX_PROP_KEYS = 32
 MAX_STR_LEN = 500
@@ -21,8 +22,9 @@ SESSION_IDLE_MS = 30 * 60 * 1000
 BOT_UA_KEYWORDS = ("bot", "spider", "crawl", "slurp", "bingpreview", "headless", "lighthouse")
 EVENT_PROP_WHITELIST = {          # spec §9.1：未知字段拒绝。免费文本/任意属性不得入库
     "page_view": {"referrer", "referrer_domain", "utm", "nav_type", "prerendering"},
-    "page_stay": {"active_ms", "path"},
-    "sdk_loaded": {"sdk_version"},
+    "page_stay": {"active_ms", "path", "active_from", "active_to", "flush_reason", "measurement_version"},
+    "sdk_loaded": {"sdk_version", "build_id", "schema_version", "config_version"},
+    "session_resume": {"prev_session_id", "reason"},
 }
 MAX_PROP_DEPTH = 2
 MAX_PROP_JSON_BYTES = 4096