fix: wrap raw list returns in response models to produce single TextContent block

MCP tools returning raw lists caused FastMCP's _convert_to_content() to create
one TextContent block per element. Most MCP clients only read content[0], so
they saw a single result instead of the full list.

Wrapped 9 tool functions in proper response objects:
- deck: deck_get_boards, deck_get_stacks, deck_get_cards, deck_get_labels
- calendar: nc_calendar_list_events, nc_calendar_get_upcoming_events
- contacts: nc_contacts_list_addressbooks, nc_contacts_list_contacts
- tables: nc_tables_list_tables

Closes #568

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

nextcloud_mcp_server/server/tables.py

@@ -5,6 +5,7 @@ from mcp.types import ToolAnnotations
 
 from nextcloud_mcp_server.auth import require_scopes
 from nextcloud_mcp_server.context import get_client
+from nextcloud_mcp_server.models.tables import ListTablesResponse, Table
 from nextcloud_mcp_server.observability.metrics import instrument_tool
 
 logger = logging.getLogger(__name__)
@@ -18,10 +19,12 @@ def configure_tables_tools(mcp: FastMCP):
     )
     @require_scopes("tables:read")
     @instrument_tool
-    async def nc_tables_list_tables(ctx: Context):
+    async def nc_tables_list_tables(ctx: Context) -> ListTablesResponse:
         """List all tables available to the user"""
         client = await get_client(ctx)
-        return await client.tables.list_tables()
+        tables_data = await client.tables.list_tables()
+        tables = [Table(**t) for t in tables_data]
+        return ListTablesResponse(tables=tables, total_count=len(tables))
 
     @mcp.tool(
         title="Get Table Schema",