Adjust biome resource modifiers for balance across various biomes

[Vianpyro]

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[Copilot]

Pull request overview

This PR adjusts per-biome passive resource production modifiers to rebalance city resource outcomes across multiple land and water biomes.

Changes:

• Tweaks ResourceModifiers::new(wood, stone, food, metal, favor) values for a set of core biomes (e.g., Plains, Forest, Mountains).
• Adjusts modifiers for shoreline/water-adjacent biomes (Ocean/Coast/Deep Harbor) to change their contribution to nearby city resource scans.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/biome/defs/valley.rs	Updates Valley resource modifier values.
src/biome/defs/tundra.rs	Updates Tundra resource modifier values.
src/biome/defs/swamp.rs	Updates Swamp resource modifier values.
src/biome/defs/snowy_peaks.rs	Updates Snowy Peaks resource modifier values.
src/biome/defs/sacred_grove.rs	Updates Sacred Grove resource modifier values.
src/biome/defs/plains.rs	Updates Plains resource modifier values.
src/biome/defs/ocean.rs	Updates Ocean resource modifier values.
src/biome/defs/mountains.rs	Updates Mountains resource modifier values.
src/biome/defs/hills.rs	Updates Hills resource modifier values.
src/biome/defs/highlands.rs	Updates Highlands resource modifier values.
src/biome/defs/forest.rs	Updates Forest resource modifier values.
src/biome/defs/desert.rs	Updates Desert resource modifier values.
src/biome/defs/deep_harbor.rs	Updates Deep Harbor resource modifier values.
src/biome/defs/coast.rs	Updates Coast resource modifier values.
src/biome/defs/beach.rs	Updates Beach resource modifier values.

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