feat: extract shared infrastructure from shared_lib

Phase 1-3 of decoupling plan:
- Shared DB, models, infrastructure, browser, config, utils
- Event infrastructure (domain_events outbox, bus, processor)
- Structured logging
- Generic container concept (container_type/container_id)
- Alembic migrations for all schema changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

browser/app/utils/parse.py

@@ -0,0 +1,36 @@
+from datetime import datetime, timezone
+
+def parse_time(val: str | None):
+    if not val:
+        return None
+    try:
+        h,m = val.split(':', 1)
+        from datetime import time
+        return time(int(h), int(m))
+    except Exception:
+        return None
+
+def parse_cost(val: str | None):
+    if not val:
+        return None
+    try:
+        return float(val)
+    except Exception:
+        return None
+
+    if not val:
+        return None
+    dt = datetime.fromisoformat(val)
+    # make TZ-aware (assume local if naive; convert to UTC)
+    if dt.tzinfo is None:
+        dt = dt.replace(tzinfo=timezone.utc)
+    return dt
+
+def parse_dt(val: str | None) -> datetime | None:
+    if not val:
+        return None
+    dt = datetime.fromisoformat(val)
+    if dt.tzinfo is None:
+        dt = dt.replace(tzinfo=timezone.utc)
+    return dt
+