Remove dead code: domain_event.py + 39 overridden templates

- Delete shared/models/domain_event.py (table dropped, model orphaned)
- Delete 39 shared templates that are overridden by app-local copies:
  - 8 blog overrides (blog/_action_buttons, post/_meta, etc.)
  - 27 events overrides (calendar/*, day/*, entry/*, post_entries/*)
  - 4 market overrides (market/index, browse/_oob_elements, etc.)

These shared copies were never served — Quart loads app-level
templates first, so the app-local versions always win.

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

models/domain_event.py

@@ -1,30 +0,0 @@
-from __future__ import annotations
-
-from datetime import datetime
-from sqlalchemy import String, Integer, DateTime, Text, func
-from sqlalchemy.dialects.postgresql import JSONB
-from sqlalchemy.orm import Mapped, mapped_column
-from shared.db.base import Base
-
-
-class DomainEvent(Base):
-    __tablename__ = "domain_events"
-
-    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
-    event_type: Mapped[str] = mapped_column(String(128), nullable=False, index=True)
-    aggregate_type: Mapped[str] = mapped_column(String(64), nullable=False)
-    aggregate_id: Mapped[int] = mapped_column(Integer, nullable=False)
-    payload: Mapped[dict | None] = mapped_column(JSONB, nullable=True)
-    state: Mapped[str] = mapped_column(
-        String(20), nullable=False, default="pending", server_default="pending", index=True
-    )
-    attempts: Mapped[int] = mapped_column(Integer, nullable=False, default=0, server_default="0")
-    max_attempts: Mapped[int] = mapped_column(Integer, nullable=False, default=5, server_default="5")
-    last_error: Mapped[str | None] = mapped_column(Text, nullable=True)
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), nullable=False, server_default=func.now()
-    )
-    processed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
-
-    def __repr__(self) -> str:
-        return f"<DomainEvent {self.id} {self.event_type} [{self.state}]>"