umputun / reproxy / 25770167686

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feat: per-route timeout and throttle (#140)

* add plan: per-route-timeout-throttle

* feat: add Timeout and Throttle fields to URLMapper with file provider parsing

Adds per-route Timeout (time.Duration) and Throttle (int) fields to the
URLMapper struct. Zero values preserve existing global-fallback behavior.

extendMapper now propagates both fields through the simple-extension path
so routes like /api/ -> /dst/ don't silently lose per-route config before
reaching Match().

File (yaml) provider parses timeout as a duration string and throttle as
int. Negative timeout/throttle values surface as parse errors.

Part of plan 20260512-per-route-timeout-throttle.md (Task 1 of 10).

* feat: extend static provider CSV format with timeout and throttle fields

Extend rule format from server,source,dest[,ping[,forward-health-checks]]
to server,source,dest[,ping[,forward-health-checks[,timeout[,throttle]]]].
Empty positional fields inherit global defaults; invalid duration,
non-integer throttle, or negative values return parse errors at startup.

* feat: add timeout and throttle labels to docker provider

Read reproxy.<n>.timeout and reproxy.<n>.throttle labels via the
existing labelN helper. Invalid duration, non-integer, or negative
values warn and fall back to zero (matches the warn-and-zero pattern
of forward-health-checks/keep-host), so a single bad label cannot
crash discovery for the entire fleet.

* feat: add timeout and throttle labels to consul-catalog provider

Parse reproxy.timeout and reproxy.throttle labels with warn-and-zero
semantics matching the docker provider behavior.

* feat: add routeTimeoutHandler middleware for per-route request deadlines

When a matched URLMapper has Timeout > 0, wrap the request context with
context.WithTimeout and override the connection's read/write deadlines via
http.ResponseController. The middleware runs immediately after matchHandler
and before per-route auth/throttle so auth and limiter work runs inside the
per-r... (continued)

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