feat(core): support other status codes in Redirect

[m4tx]

Type of change

• Bug fix
• New feature
• Documentation
• Refactor / cleanup
• Performance improvement
• Other (describe above)

[Copilot]

Pull request overview

This PR extends Cot’s Redirect response type to support multiple redirect status codes (beyond the previous fixed 303 See Other), while keeping Redirect::new as the ergonomic default for typical post/redirect/get flows.

Changes:

• Refactored Redirect from a single String into a struct carrying both location and status_code.
• Added constructors for common redirect semantics (see_other, permanent, temporary) plus a validated with_status_code.
• Updated IntoResponse for Redirect and added tests to cover the new behavior (including validation panic for non-3xx codes).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cot-core/src/response/into_response.rs	Builds redirect responses using the new Redirect accessors (status_code() / location()).
cot-core/src/response.rs	Introduces the new Redirect struct shape, adds redirect constructors/accessors, and adds tests for status code + location behavior.

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[github-actions]

Bencher Report

Project	cot
Branch	redirect-statuses
Testbed	github-ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	Benchmark Result microseconds (µs) (Result Δ%)	Upper Boundary microseconds (µs) (Limit %)
empty_router/empty_router	📈 view plot 🚷 view threshold	14,152.00 µs (+78.06%) Baseline: 7,948.08 µs	14,750.67 µs (95.94%)
json_api/json_api	📈 view plot 🚷 view threshold	1,003.60 µs (-5.93%) Baseline: 1,066.89 µs	1,384.95 µs (72.46%)
nested_routers/nested_routers	📈 view plot 🚷 view threshold	969.96 µs (-2.60%) Baseline: 995.88 µs	1,263.08 µs (76.79%)
single_root_route/single_root_route	📈 view plot 🚷 view threshold	942.48 µs (-1.73%) Baseline: 959.04 µs	1,226.81 µs (76.82%)
single_root_route_burst/single_root_route_burst	📈 view plot 🚷 view threshold	18,148.00 µs (+5.57%) Baseline: 17,189.72 µs	21,743.12 µs (83.47%)

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