refactor: A28 lot 3 — collections.py (2 622 L) → package 13 fichiers (v7.31.0)

Découpe par concern de l'ancien app/routers/collections.py (2 622 lignes,
53 endpoints / 52 fonctions) en package `app/routers/collections/` :

- 10 modules de routes : crud 337 L (6 r.), properties 322 (8),
  linked 286 (7), structure 267 (8), dashboard_views 214 (3),
  meta 197 (5), views 187 (6), pages 184 (4), data_api 122 (2),
  boards 61 (3)
- _common.py (220 L) : 8 helpers auth/permissions/validation
- _renderers.py (667 L) : 15 rendus HTML des vues + CHART_MAX_GROUPS
- __init__.py : ré-exports connus (_validate_page_properties pour
  automations ; _chart_values/_chart_aggregate/_fmt_number/_render_chart
  pour les tests) + __all__

Preuve contractuelle : docs/openapi-v2.json régénéré = IDENTIQUE
byte-à-byte (509 chemins, ordre préservé).

Pièges rattrapés :
- docstring d'origine conservée dans le header copié → F404
  (from __future__ après un statement) → slice [1:30]
- décorateurs empilés (view_collection ×2) : segment sans def →
  skip du 2e décorateur (53 endpoints = 52 unités)
- CHART_MAX_GROUPS hors détection des helpers (F821) → import ._renderers
- test_csp_no_cdn_and_vendor lisait collections.py → balayage du package

Reste A28 : board.py 2 101 L (lot 4).

suite **1091/1091** · ruff OK · OpenAPI 509 identique · docs à jour

app/routers/collections/data_api.py

@@ -0,0 +1,122 @@
+"""FlowDeck — Collections : data_api.
+
+Découpe A28 de l'ancien app/routers/collections.py (2 622 lignes, 53 routes) — un module par concern, contrat inchangé.
+"""
+from __future__ import annotations
+
+import json
+import logging
+
+from fastapi import APIRouter, Body, HTTPException, Request
+
+from app.db import get_conn
+from app.services.automations import fire_event, run_event_sync
+from app.services.property_types import (
+    apply_auto_properties,
+)
+
+from ._common import (
+    _collection_properties,
+    _current_user,
+    _require_edit,
+    _require_view,
+    _session_user,
+    _validate_meta_keys,
+    _validate_page_properties,
+)
+
+logger = logging.getLogger(__name__)
+router = APIRouter(tags=["collections"], prefix="/db")
+
+
+
+
+@router.get("/{collection_id}/api")
+def get_collection_api(request: Request, collection_id: int):
+    """API: get a single collection with its pages."""
+    # v6.0.0: granular collection permissions — hide restricted collections.
+    _require_view(collection_id, _session_user(request))
+    with get_conn() as conn:
+        collection = conn.execute(
+            "SELECT * FROM collections WHERE id=?", (collection_id,)
+        ).fetchone()
+        if not collection:
+            raise HTTPException(status_code=404, detail="Collection not found")
+
+        pages = conn.execute(
+            "SELECT * FROM collection_pages WHERE collection_id=? ORDER BY position",
+            (collection_id,),
+        ).fetchall()
+        views = conn.execute(
+            "SELECT * FROM collection_views WHERE collection_id=? ORDER BY position",
+            (collection_id,),
+        ).fetchall()
+
+    return {
+        "collection": dict(collection),
+        "pages": [dict(p) for p in pages],
+        "views": [dict(v) for v in views],
+    }
+
+
+
+
+@router.post("/{collection_id}/pages/api")
+def create_page_api(request: Request, collection_id: int, body: dict = Body(default={})):
+    """API: create a page in a collection."""
+    # v6.0.0: granular collection permissions — viewer/commenter cannot create.
+    _require_view(collection_id, _session_user(request))
+    _require_edit(collection_id, _session_user(request))
+
+    title = body.get("title", "").strip()
+    if not title:
+        raise HTTPException(status_code=400, detail="title is required")
+
+    icon = body.get("icon", "📄")
+    property_values = body.get("properties", {})
+    cover_url = body.get("cover_url", "")
+    gitea_issue_id = body.get("gitea_issue_id")
+    gitea_issue_number = body.get("gitea_issue_number")
+
+    with get_conn() as conn:
+        coll = conn.execute("SELECT id FROM collections WHERE id=?", (collection_id,)).fetchone()
+        if not coll:
+            raise HTTPException(status_code=404, detail="Collection not found")
+
+        _validate_page_properties(conn, collection_id, property_values)
+        _validate_meta_keys(conn, collection_id, property_values)
+        apply_auto_properties(
+            _collection_properties(conn, collection_id),
+            property_values,
+            _current_user(request),
+            is_create=True,
+        )
+
+        max_pos = conn.execute(
+            "SELECT COALESCE(MAX(position), -1) + 1 FROM collection_pages WHERE collection_id=?",
+            (collection_id,),
+        ).fetchone()[0]
+
+        cur = conn.execute(
+            """INSERT INTO collection_pages
+               (collection_id, title, icon, cover_url, position, gitea_issue_id, gitea_issue_number, property_values_json)
+               VALUES (?, ?, ?, ?, ?, ?, ?, ?)""",
+            (collection_id, title, icon, cover_url, max_pos, gitea_issue_id, gitea_issue_number,
+             json.dumps(property_values)),
+        )
+        conn.commit()
+        page_id = cur.lastrowid
+
+    run_event_sync(fire_event("page.created", {
+        "page_id": page_id,
+        "collection_id": collection_id,
+        "title": title,
+        "icon": icon,
+        "properties": property_values,
+    }))
+    run_event_sync(fire_event("collection.page.created", {
+        "page_id": page_id,
+        "collection_id": collection_id,
+        "title": title,
+    }))
+    return {"id": page_id, "title": title, "status": "created"}