feat(examples): postgres-backed MCP server with filesystem authorization #1952

Job	Run time
checks / pre-commit	42s
checks / readme-snippets	11s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.11, lowest-direct, windows-latest)	2m 44s
checks / test (3.10, locked, windows-latest)	2m 35s
checks / test (3.10, lowest-direct, windows-latest)	2m 31s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, locked, windows-latest)	2m 31s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.11, locked, windows-latest)	3m 11s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.13, locked, ubuntu-latest)	51s
checks / test (3.12, locked, windows-latest)	3m 24s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, windows-latest)	3m 8s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.14, lowest-direct, windows-latest)	2m 31s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.11, locked, ubuntu-latest)	51s
checks / test (3.14, locked, windows-latest)	3m 5s
checks / test (3.12, lowest-direct, windows-latest)	3m 34s
checks / test (3.14, locked, ubuntu-latest)	2m 21s
all-green	3s
	41m 15s

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