feat(providers): add BytePlus ModelArk Coding Plan provider

providers/byteplus-coding-plan/models/deepseek-v4-flash.toml

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+# Coding Plan model name per the official activity page (accessed 2026-10-10)
+# and the runtime-verified alias report in anomalyco/models.dev#5857.
+# Subscription tier: no per-token price.
+# Toggle: thinking.type = enabled|disabled, matching the sibling Volcengine Ark
+# Coding Plan measurement on the same platform (providers/volcengine-coding-plan)
+# and the toggle the lab (providers/deepseek) exposes. No graded effort: the wire
+# accepts reasoning_effort, but graded levels fully overlap there; not
+# independently re-measured on this host.
+base_model = "deepseek/deepseek-v4-flash"
+
+[[reasoning_options]]
+type = "toggle"
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0

providers/byteplus-coding-plan/models/deepseek-v4-pro.toml

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+# Coding Plan model name per the official activity page (accessed 2026-10-10)
+# and the runtime-verified alias report in anomalyco/models.dev#5857.
+# Subscription tier: no per-token price.
+# Toggle: thinking.type = enabled|disabled, matching the sibling Volcengine Ark
+# Coding Plan measurement on the same platform (providers/volcengine-coding-plan)
+# and the toggle the lab (providers/deepseek) exposes. No graded effort: the wire
+# accepts reasoning_effort, but graded levels fully overlap there; not
+# independently re-measured on this host.
+base_model = "deepseek/deepseek-v4-pro"
+
+[[reasoning_options]]
+type = "toggle"
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0

providers/byteplus-coding-plan/models/dola-seed-2.0-code.toml

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+# Coding Plan model name per the official activity page (accessed 2026-10-10)
+# and the runtime-verified alias report in anomalyco/models.dev#5857.
+# Subscription tier: no per-token price.
+# Effort: reasoning_effort = none|low|high. Levels follow the sibling Volcengine
+# Ark Coding Plan measurements for the Seed 2.0 family on the same platform
+# (providers/volcengine-coding-plan); not independently re-measured on this host.
+base_model = "bytedance-seed/seed-2.0-code"
+
+[[reasoning_options]]
+type = "effort"
+values = ["none", "low", "high"]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0

providers/byteplus-coding-plan/models/dola-seed-2.0-lite.toml

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+# Coding Plan model name per the official activity page (accessed 2026-10-10)
+# and the runtime-verified alias report in anomalyco/models.dev#5857.
+# Subscription tier: no per-token price.
+# Effort: reasoning_effort = none|low|high, measured on the sibling Volcengine
+# Ark Coding Plan endpoint for this same model on the same platform
+# (providers/volcengine-coding-plan): the wire accepts medium and max too, but
+# medium aliases low and max sits inside the high band, so only none|low|high
+# hold up. Not independently re-measured on this host.
+base_model = "bytedance-seed/seed-2.0-lite"
+
+[[reasoning_options]]
+type = "effort"
+values = ["none", "low", "high"]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0

providers/byteplus-coding-plan/models/dola-seed-2.0-pro.toml

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+# Coding Plan model name per the official activity page (accessed 2026-10-10)
+# and the runtime-verified alias report in anomalyco/models.dev#5857.
+# Subscription tier: no per-token price.
+# Effort: reasoning_effort = none|low|high. Levels follow the sibling Volcengine
+# Ark Coding Plan measurements for the Seed 2.0 family on the same platform
+# (providers/volcengine-coding-plan); not independently re-measured on this host.
+base_model = "bytedance-seed/seed-2.0-pro"
+
+[[reasoning_options]]
+type = "effort"
+values = ["none", "low", "high"]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0

providers/byteplus-coding-plan/models/glm-5.3-flash.toml

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+# Coding Plan model name per the official activity page (accessed 2026-10-10)
+# and the runtime-verified alias report in anomalyco/models.dev#5857.
+# Subscription tier: no per-token price.
+# Effort: reasoning_effort = low|high|max, mirroring the sibling Volcengine Ark
+# Coding Plan entry on the same platform (providers/volcengine-coding-plan) and
+# providers/zai-coding-plan. No toggle declared there: thinking.type=disabled is
+# rejected. Not independently re-measured on this host.
+base_model = "zhipuai/glm-5.3-flash"
+
+[[reasoning_options]]
+type = "effort"
+values = ["low", "high", "max"]
+
+[interleaved]
+field = "reasoning_content"
+
+[cost]
+input = 0
+output = 0
+cache_read = 0

providers/byteplus-coding-plan/provider.toml

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+name = "BytePlus ModelArk Coding Plan"
+env = ["BYTEPLUS_CODING_PLAN_API_KEY"]
+npm = "@ai-sdk/openai-compatible"
+# Coding Plan is a subscription tier of BytePlus ModelArk (international
+# ap-southeast-1) with its own base URL. BytePlus warns that calling the
+# pay-as-you-go https://ark.ap-southeast.bytepluses.com/api/v3 with a Coding
+# Plan key does not draw down the subscription and bills separately, so the two
+# must stay distinct; a dedicated env var avoids lighting up both at once.
+# Anthropic-compatible base on the same key: https://ark.ap-southeast.bytepluses.com/api/coding
+# Reasoning wire format follows the Volcengine Ark Coding Plan sibling on the
+# same platform; see per-model comments for sources.
+# Models per the official activity page and the runtime-verified alias report
+# in anomalyco/models.dev#5857 (accessed 2026-10-10).
+# Sources:
+# https://www.byteplus.com/en/activity/codingplan
+# https://docs.byteplus.com/en/docs/ModelArk/2628972
+doc = "https://www.byteplus.com/en/activity/codingplan"
+api = "https://ark.ap-southeast.bytepluses.com/api/coding/v3"