docs(mobile): actualizar API v1.1 (templates globales+pivot, feature_types, issues enriquecidas)

- openapi.yaml: bumped a 1.1.0, añadido changelog con los cambios acumulados
  respecto al brief inicial; /templates y bundle.templates documentan que ahora
  usan pivot (asignación por proyecto); enums de issue documentados.
- MOBILE_APP_BRIEF.md: reescrito para reflejar v1.1 — bundle con feature_types /
  issue_tasks / issue_comments; feature con feature_type_id/is_active; issue.type;
  nuevas ops (issue.update, issue_task.*, issue_comment.create); parent_entity
  admite issue_task/issue_comment; deleted incluye tasks/comments; y bloque
  detallado sobre templates ahora globales con fields[].group/question/help.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docs/openapi.yaml

@@ -1,11 +1,37 @@
 openapi: 3.0.3
 info:
   title: ConstruProgress Mobile API
-  version: "1.0.0"
+  version: "1.1.0"
   description: >
     Offline-first sync API for the mobile app. Auth via Laravel Sanctum bearer
     tokens (ability `mobile-sync`). All protected endpoints require
     `Authorization: Bearer <token>`. See docs/MOBILE_SYNC_PROTOCOL.md.
+
+
+    ## Changelog (from v1.0)
+
+
+    - Inspection templates are now **global** and assigned to projects via
+      pivot. `bundle.templates` and `/templates` return templates *assigned* to
+      the accessible projects (no longer filtered by `project_id`).
+      `template.phase_id` was **removed**. `project_id` remains in the schema
+      for compatibility but no longer determines visibility.
+
+    - Template `fields[]` items may include `group` (section), `question` (short
+      prompt shown at inspection time) and `help` (long help text).
+
+    - New entities in the bundle: `feature_types` (global catalogue),
+      `issue_tasks`, `issue_comments`.
+
+    - `feature` gains `feature_type_id`, `is_active`; `issue` gains `type`.
+
+    - New `/sync` ops: `issue.update`, `issue_task.create`, `issue_task.update`,
+      `issue_comment.create`. `feature.update` accepts `is_active` and
+      `feature_type_id`; `issue.create`/`update` accept `type`.
+
+    - `POST /media` `parent_entity` also accepts `issue_task` and `issue_comment`.
+
+    - `deleted` tombstones include `issue_tasks` and `issue_comments`.
 servers:
   - url: /api/v1
 security:
@@ -85,7 +111,12 @@ paths:
         "403": { description: Not a member of the project }
   /templates:
     get:
-      summary: Inspection templates for accessible projects (with version/hash)
+      summary: Global inspection templates ASSIGNED to any accessible project (via pivot)
+      description: >
+        Templates are a global catalogue. This endpoint returns the templates
+        that have been *assigned* (via `inspection_template_project` pivot) to
+        any of the user's accessible projects. Each item includes `version`
+        (updated_at timestamp) and `hash` for change detection.
       parameters:
         - name: since
           in: query
@@ -183,12 +214,33 @@ components:
         phases: { type: array, items: { type: object } }
         layers: { type: array, items: { type: object } }
         features: { type: array, items: { type: object } }
-        feature_types: { type: array, items: { type: object } }
+        feature_types:
+          type: array
+          description: Global catalogue of feature types (id, name, color)
+          items: { type: object }
         inspections: { type: array, items: { type: object } }
-        issues: { type: array, items: { type: object } }
-        issue_tasks: { type: array, items: { type: object } }
-        issue_comments: { type: array, items: { type: object } }
-        templates: { type: array, items: { type: object } }
+        issues:
+          type: array
+          description: >
+            Includes `type` (defect|safety|quality|documentation|other),
+            `status` (open|in_review|resolved|closed),
+            `priority` (low|medium|high|critical).
+          items: { type: object }
+        issue_tasks:
+          type: array
+          description: Checklist tasks per issue.
+          items: { type: object }
+        issue_comments:
+          type: array
+          description: Comment thread per issue.
+          items: { type: object }
+        templates:
+          type: array
+          description: >
+            Templates assigned to this project via pivot (no longer filtered by
+            project_id). Each item exposes version/hash for change detection and
+            `fields[]` where each field may include `group`, `question`, `help`.
+          items: { type: object }
         media: { type: array, items: { type: object } }
         deleted:
           type: object