Add Gitea Actions workflows, CI config, and docs

.gitea/ISSUE_TEMPLATE/performance_improvement.yml

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+name: Performance Improvement
+about: Report a performance problem or request an optimization
+title: "[Performance] "
+labels:
+  - performance
+body:
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: Short summary of the performance problem or optimization.
+    validations:
+      required: true
+
+  - type: textarea
+    id: observed
+    attributes:
+      label: Observed Behavior
+      description: What is currently happening? Include metrics, traces, screenshots.
+    validations:
+      required: true
+
+  - type: textarea
+    id: target
+    attributes:
+      label: Expected Behavior / Target
+      description: "What improvement do we expect? e.g. latency < 200ms, memory < X MB."
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction / Benchmark
+      description: How to reproduce or reference a benchmark (commands, dataset, environment).
+
+  - type: textarea
+    id: optimization
+    attributes:
+      label: Proposed Optimization
+      description: High-level plan or hypothesis for fix/optimization.
+
+  - type: textarea
+    id: measurement
+    attributes:
+      label: Measurement Plan
+      description: "How to measure before/after: specific metrics, dashboards."
+
+  - type: textarea
+    id: risks
+    attributes:
+      label: Risks & Rollback
+      description: Potential risks and fallback plan.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      options:
+        - label: Baseline metrics captured
+        - label: Benchmark scripts included or linked