feat(stress-test): add comprehensive stress testing suite using Locust (#25617)

Signed-off-by: -LAN- <laipz8200@outlook.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

scripts/stress-test/locust.conf

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+# Locust configuration file for Dify SSE benchmark
+
+# Target host
+host = http://localhost:5001
+
+# Number of users to simulate
+users = 10
+
+# Spawn rate (users per second)
+spawn-rate = 2
+
+# Run time (use format like 30s, 5m, 1h)
+run-time = 1m
+
+# Locustfile to use
+locustfile = scripts/stress-test/sse_benchmark.py
+
+# Headless mode (no web UI)
+headless = true
+
+# Print stats in the console
+print-stats = true
+
+# Only print summary stats
+only-summary = false
+
+# Reset statistics after ramp-up
+reset-stats = false
+
+# Log level
+loglevel = INFO
+
+# CSV output (uncomment to enable)
+# csv = reports/locust_results
+
+# HTML report (uncomment to enable)
+# html = reports/locust_report.html