feat: decouple events from shared_lib, add app-owned models

Phase 1-3 of decoupling:
- path_setup.py adds project root to sys.path
- Events-owned models in events/models/ (calendars with all related models)
- All imports updated: shared.infrastructure, shared.db, shared.browser, etc.
- Calendar uses container_type/container_id instead of post_id FK
- CalendarEntryPost uses content_type/content_id (generic content refs)

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

bp/markets/routes.py

@@ -5,16 +5,16 @@ from quart import (
 )
 from sqlalchemy import select
 
-from models.market_place import MarketPlace
+from market.models.market_place import MarketPlace
 
 from .services.markets import (
     create_market as svc_create_market,
     soft_delete as svc_soft_delete,
 )
 
-from suma_browser.app.redis_cacher import cache_page, clear_cache
-from suma_browser.app.authz import require_admin
-from suma_browser.app.utils.htmx import is_htmx_request
+from shared.browser.app.redis_cacher import cache_page, clear_cache
+from shared.browser.app.authz import require_admin
+from shared.browser.app.utils.htmx import is_htmx_request
 
 
 def register():

bp/markets/services/markets.py

@@ -6,9 +6,9 @@ import unicodedata
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from models.market_place import MarketPlace
-from models.ghost_content import Post
-from suma_browser.app.utils import utcnow
+from market.models.market_place import MarketPlace
+from blog.models.ghost_content import Post
+from shared.browser.app.utils import utcnow
 
 
 class MarketError(ValueError):
@@ -47,7 +47,7 @@ async def create_market(sess: AsyncSession, post_id: int, name: str) -> MarketPl
 
     # Look for existing (including soft-deleted)
     existing = (await sess.execute(
-        select(MarketPlace).where(MarketPlace.post_id == post_id, MarketPlace.slug == slug)
+        select(MarketPlace).where(MarketPlace.container_type == "page", MarketPlace.container_id == post_id, MarketPlace.slug == slug)
     )).scalar_one_or_none()
 
     if existing:
@@ -58,7 +58,7 @@ async def create_market(sess: AsyncSession, post_id: int, name: str) -> MarketPl
             return existing
         raise MarketError(f'Market with slug "{slug}" already exists for this page.')
 
-    market = MarketPlace(post_id=post_id, name=name, slug=slug)
+    market = MarketPlace(container_type="page", container_id=post_id, name=name, slug=slug)
     sess.add(market)
     await sess.flush()
     return market
@@ -68,7 +68,8 @@ async def soft_delete(sess: AsyncSession, post_slug: str, market_slug: str) -> b
     market = (
         await sess.execute(
             select(MarketPlace)
-            .join(Post, MarketPlace.post_id == Post.id)
+            .join(Post, MarketPlace.container_id == Post.id)
+            .where(MarketPlace.container_type == "page")
             .where(
                 Post.slug == post_slug,
                 MarketPlace.slug == market_slug,