refactor(db)!: adopt project-routed pooled databases

Reorganize WNDB by responsibility and remove legacy scheme endpoints.\n\nRoute analysis and time-series access through project pools, preserve transactional realtime replacement, and refresh GIS materialized views after writes.\n\nAdd database architecture documentation, live pooling coverage, API contract updates, and executable container verification.\n\nBREAKING CHANGE: legacy scheme APIs and flat app.native.wndb module imports are removed.

app/native/wndb/gis/backdrop.py

@@ -0,0 +1,44 @@
+from typing import Any
+
+from ..core.database import (
+    ChangeSet,
+    DatabaseCommand,
+    execute_command,
+    g_update_prefix,
+    read,
+    sql_literal,
+)
+
+
+def get_backdrop_schema(name: str) -> dict[str, dict[str, Any]]:
+    return { 'content' : {'type': 'str' , 'optional': False , 'readonly': False} }
+
+
+def get_backdrop(name: str) -> dict[str, Any]:
+    e = read(name, "select content from gis.backdrops where id = true")
+    return { 'content': e['content'] }
+
+
+def _set_backdrop(name: str, cs: ChangeSet) -> DatabaseCommand:
+    statement = f"update gis.backdrops set content = {sql_literal(cs.operations[0]['content'])} where id = true;"
+
+    change = g_update_prefix | { 'type': 'backdrop', 'content': cs.operations[0]['content'] }
+
+    return DatabaseCommand(statement, [change])
+
+
+def set_backdrop(name: str, cs: ChangeSet) -> ChangeSet:
+    return execute_command(name, _set_backdrop(name, cs))
+
+
+def inp_in_backdrop(section: list[str]) -> str:
+    if section == []:
+        return str('')
+
+    content = '\n'.join(section)
+    return str(f"update gis.backdrops set content = {sql_literal(content)} where id = true;")
+
+
+def inp_out_backdrop(name: str) -> list[str]:
+    obj = str(get_backdrop(name)['content'])
+    return obj.split('\n')