feat: per-model routing with configurable routes

[MagicalTux]

What

Turns model routing from a single implicit pipe into per-model routing over one shared account pool, and makes the model categories configurable. Addresses #85 (per-model routing) and the "show the request model immediately" gap.

Behavior (works with zero config)

Selection used to gate/rank every request on the shared unified5h/unified7d buckets, so an account whose Fable bucket was spent looked busy for everything. Now each request is gated and ranked on the bucket that governs its family:

• fable → unified7dFable, sonnet → unified7dSonnet, opus/other → unified7d, all still under the shared 5h.
• A spent Fable/Sonnet weekly bucket bars only that family; the account keeps serving the others.
• Selection spends the account whose governing weekly resets soonest, preserving accounts that reset later for other families.
• Falls back to the shared weekly when a family bucket isn't reported, so nothing sails past an overall cap.

This generalizes (and removes) the old Fable-only special case, and Sonnet is now consulted the same way.

Configurable routes

A routes table pins model globs to an exclusive set of accounts (first match wins), with an optional quota-bucket override:

"routes": [
  { "name": "fable", "match": ["*fable*"], "accounts": ["personal-max"] },
  { "name": "bulk",  "match": ["*opus*","*sonnet*"], "accounts": ["corp-1","corp-2"], "bucket": "unified7d" }
]

• No matching route → falls back to PR feat: add third-party backend account support (upstream, modelMap, models) #74's per-account models claim, so existing configs keep working (routes supersede it).
• Applied live on config reload.
• Manage three ways: config file, teamclaude route list|add|rm, or the TUI settings screen (g → Manage routing; a/e/d).

Show the request model live

The model now streams into the TUI in-flight rows the instant the top-level model field is peeked from the request body (via the existing streaming finder), on both the base and MITM paths — previously it only appeared once the request finished.

Console

status and the TUI show a Routing table (configured routes + auto-detected family routes tagged (auto), derived live and never persisted) plus a per-account per-model eligibility line (Models Opus ✓ Fable ✗ 2d / ⊘ Fable).

Tests

+17 tests: glob matching, exclusive routing + index match + bucket override + legacy fallback + reload, streaming model peek, status routing/eligibility rendering, and the TUI routes editor (add/edit/delete). Full suite green (217), lint clean.

Notes

• Stacks on current master (1.1.5), which already merged WIP Fix: recover from network drops without restarting #73/feat: add third-party backend account support (upstream, modelMap, models) #74/Feature request: start idle accounts’ 5h timers with a minimal request #76/Fix: revalidate throttled accounts so a stale 429 hold cannot require a restart #77.
• No new dependencies.

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